WordPress 4.0
[autoinstalls/wordpress.git] / wp-includes / class-http.php
index 5d7f83d87b8b581aeca06f398a90afd3bedc0645..8a23836385e7f9d69d509c0b9a40bcad1d812433 100644 (file)
 /**
  * WordPress HTTP Class for managing HTTP Transports and making HTTP requests.
  *
- * This class is called for the functionality of making HTTP requests and replaces Snoopy
- * functionality. There is no available functionality to add HTTP transport implementations, since
- * most of the HTTP transports are added and available for use.
- *
- * There are no properties, because none are needed and for performance reasons. Some of the
- * functions are static and while they do have some overhead over functions in PHP4, the purpose is
- * maintainability. When PHP5 is finally the requirement, it will be easy to add the static keyword
- * to the code. It is not as easy to convert a function to a method after enough code uses the old
- * way.
+ * This class is used to consistently make outgoing HTTP requests easy for developers
+ * while still being compatible with the many PHP configurations under which
+ * WordPress runs.
  *
  * Debugging includes several actions, which pass different variables for debugging the HTTP API.
  *
- * <strong>http_transport_get_debug</strong> - gives working, nonblocking, and blocking transports.
- *
- * <strong>http_transport_post_debug</strong> - gives working, nonblocking, and blocking transports.
- *
  * @package WordPress
  * @subpackage HTTP
  * @since 2.7.0
 class WP_Http {
 
        /**
-        * PHP4 style Constructor - Calls PHP5 Style Constructor
-        *
-        * @since 2.7.0
-        * @return WP_Http
-        */
-       function WP_Http() {
-               $this->__construct();
-       }
-
-       /**
-        * PHP5 style Constructor - Set up available transport if not available.
-        *
-        * PHP4 does not have the 'self' keyword and since WordPress supports PHP4, the class needs to
-        * be used for the static call. The transport are set up to save time and will only be created
-        * once. This class can be created many times without having to go through the step of finding
-        * which transports are available.
-        *
-        * @since 2.7.0
-        * @return WP_Http
-        */
-       function __construct() {
-               WP_Http::_getTransport();
-               WP_Http::_postTransport();
-       }
-
-       /**
-        * Tests the WordPress HTTP objects for an object to use and returns it.
-        *
-        * Tests all of the objects and returns the object that passes. Also caches that object to be
-        * used later.
-        *
-        * The order for the GET/HEAD requests are HTTP Extension, cURL, Streams, Fopen, and finally
-        * Fsockopen. fsockopen() is used last, because it has the most overhead in its implementation.
-        * There isn't any real way around it, since redirects have to be supported, much the same way
-        * the other transports also handle redirects.
-        *
-        * There are currently issues with "localhost" not resolving correctly with DNS. This may cause
-        * an error "failed to open stream: A connection attempt failed because the connected party did
-        * not properly respond after a period of time, or established connection failed because [the]
-        * connected host has failed to respond."
-        *
-        * @since 2.7.0
-        * @access private
-        *
-        * @param array $args Request args, default us an empty array
-        * @return object|null Null if no transports are available, HTTP transport object.
-        */
-       function &_getTransport( $args = array() ) {
-               static $working_transport, $blocking_transport, $nonblocking_transport;
-
-               if ( is_null($working_transport) ) {
-                       if ( true === WP_Http_ExtHttp::test($args) ) {
-                               $working_transport['exthttp'] = new WP_Http_ExtHttp();
-                               $blocking_transport[] = &$working_transport['exthttp'];
-                       } else if ( true === WP_Http_Curl::test($args) ) {
-                               $working_transport['curl'] = new WP_Http_Curl();
-                               $blocking_transport[] = &$working_transport['curl'];
-                       } else if ( true === WP_Http_Streams::test($args) ) {
-                               $working_transport['streams'] = new WP_Http_Streams();
-                               $blocking_transport[] = &$working_transport['streams'];
-                       } else if ( true === WP_Http_Fopen::test($args) ) {
-                               $working_transport['fopen'] = new WP_Http_Fopen();
-                               $blocking_transport[] = &$working_transport['fopen'];
-                       } else if ( true === WP_Http_Fsockopen::test($args) ) {
-                               $working_transport['fsockopen'] = new WP_Http_Fsockopen();
-                               $blocking_transport[] = &$working_transport['fsockopen'];
-                       }
-
-                       foreach ( array('curl', 'streams', 'fopen', 'fsockopen', 'exthttp') as $transport ) {
-                               if ( isset($working_transport[$transport]) )
-                                       $nonblocking_transport[] = &$working_transport[$transport];
-                       }
-               }
-
-               do_action( 'http_transport_get_debug', $working_transport, $blocking_transport, $nonblocking_transport );
-
-               if ( isset($args['blocking']) && !$args['blocking'] )
-                       return $nonblocking_transport;
-               else
-                       return $blocking_transport;
-       }
-
-       /**
-        * Tests the WordPress HTTP objects for an object to use and returns it.
-        *
-        * Tests all of the objects and returns the object that passes. Also caches
-        * that object to be used later. This is for posting content to a URL and
-        * is used when there is a body. The plain Fopen Transport can not be used
-        * to send content, but the streams transport can. This is a limitation that
-        * is addressed here, by just not including that transport.
+        * Send an HTTP request to a URI.
         *
-        * @since 2.7.0
-        * @access private
-        *
-        * @param array $args Request args, default us an empty array
-        * @return object|null Null if no transports are available, HTTP transport object.
-        */
-       function &_postTransport( $args = array() ) {
-               static $working_transport, $blocking_transport, $nonblocking_transport;
-
-               if ( is_null($working_transport) ) {
-                       if ( true === WP_Http_ExtHttp::test($args) ) {
-                               $working_transport['exthttp'] = new WP_Http_ExtHttp();
-                               $blocking_transport[] = &$working_transport['exthttp'];
-                       } else if ( true === WP_Http_Curl::test($args) ) {
-                               $working_transport['curl'] = new WP_Http_Curl();
-                               $blocking_transport[] = &$working_transport['curl'];
-                       } else if ( true === WP_Http_Streams::test($args) ) {
-                               $working_transport['streams'] = new WP_Http_Streams();
-                               $blocking_transport[] = &$working_transport['streams'];
-                       } else if ( true === WP_Http_Fsockopen::test($args) ) {
-                               $working_transport['fsockopen'] = new WP_Http_Fsockopen();
-                               $blocking_transport[] = &$working_transport['fsockopen'];
-                       }
-
-                       foreach ( array('curl', 'streams', 'fsockopen', 'exthttp') as $transport ) {
-                               if ( isset($working_transport[$transport]) )
-                                       $nonblocking_transport[] = &$working_transport[$transport];
-                       }
-               }
-
-               do_action( 'http_transport_post_debug', $working_transport, $blocking_transport, $nonblocking_transport );
-
-               if ( isset($args['blocking']) && !$args['blocking'] )
-                       return $nonblocking_transport;
-               else
-                       return $blocking_transport;
-       }
-
-       /**
-        * Send a HTTP request to a URI.
-        *
-        * The body and headers are part of the arguments. The 'body' argument is for the body and will
-        * accept either a string or an array. The 'headers' argument should be an array, but a string
-        * is acceptable. If the 'body' argument is an array, then it will automatically be escaped
-        * using http_build_query().
-        *
-        * The only URI that are supported in the HTTP Transport implementation are the HTTP and HTTPS
-        * protocols. HTTP and HTTPS are assumed so the server might not know how to handle the send
-        * headers. Other protocols are unsupported and most likely will fail.
-        *
-        * The defaults are 'method', 'timeout', 'redirection', 'httpversion', 'blocking' and
-        * 'user-agent'.
-        *
-        * Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports technically allow
-        * others, but should not be assumed. The 'timeout' is used to sent how long the connection
-        * should stay open before failing when no response. 'redirection' is used to track how many
-        * redirects were taken and used to sent the amount for other transports, but not all transports
-        * accept setting that value.
-        *
-        * The 'httpversion' option is used to sent the HTTP version and accepted values are '1.0', and
-        * '1.1' and should be a string. Version 1.1 is not supported, because of chunk response. The
-        * 'user-agent' option is the user-agent and is used to replace the default user-agent, which is
-        * 'WordPress/WP_Version', where WP_Version is the value from $wp_version.
-        *
-        * 'blocking' is the default, which is used to tell the transport, whether it should halt PHP
-        * while it performs the request or continue regardless. Actually, that isn't entirely correct.
-        * Blocking mode really just means whether the fread should just pull what it can whenever it
-        * gets bytes or if it should wait until it has enough in the buffer to read or finishes reading
-        * the entire content. It doesn't actually always mean that PHP will continue going after making
-        * the request.
+        * Please note: The only URI that are supported in the HTTP Transport implementation
+        * are the HTTP and HTTPS protocols.
         *
         * @access public
         * @since 2.7.0
-        * @todo Refactor this code. The code in this method extends the scope of its original purpose
-        *              and should be refactored to allow for cleaner abstraction and reduce duplication of the
-        *              code. One suggestion is to create a class specifically for the arguments, however
-        *              preliminary refactoring to this affect has affect more than just the scope of the
-        *              arguments. Something to ponder at least.
-        *
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return array containing 'headers', 'body', 'response', 'cookies'
+        *
+        * @param string       $url  The request URL.
+        * @param string|array $args {
+        *     Optional. Array or string of HTTP request arguments.
+        *
+        *     @type string       $method              Request method. Accepts 'GET', 'POST', 'HEAD', or 'PUT'.
+        *                                             Some transports technically allow others, but should not be
+        *                                             assumed. Default 'GET'.
+        *     @type int          $timeout             How long the connection should stay open in seconds. Default 5.
+        *     @type int          $redirection         Number of allowed redirects. Not supported by all transports
+        *                                             Default 5.
+        *     @type string       $httpversion         Version of the HTTP protocol to use. Accepts '1.0' and '1.1'.
+        *                                             Default '1.0'.
+        *     @type string       $user-agent          User-agent value sent.
+        *                                             Default WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ).
+        *     @type bool         $reject_unsafe_urls  Whether to pass URLs through {@see wp_http_validate_url()}.
+        *                                             Default false.
+        *     @type bool         $blocking            Whether the calling code requires the result of the request.
+        *                                             If set to false, the request will be sent to the remote server,
+        *                                             and processing returned to the calling code immediately, the caller
+        *                                             will know if the request succeeded or failed, but will not receive
+        *                                             any response from the remote server. Default true.
+        *     @type string|array $headers             Array or string of headers to send with the request.
+        *                                             Default empty array.
+        *     @type array        $cookies             List of cookies to send with the request. Default empty array.
+        *     @type string|array $body                Body to send with the request. Default null.
+        *     @type bool         $compress            Whether to compress the $body when sending the request.
+        *                                             Default false.
+        *     @type bool         $decompress          Whether to decompress a compressed response. If set to false and
+        *                                             compressed content is returned in the response anyway, it will
+        *                                             need to be separately decompressed. Default true.
+        *     @type bool         $sslverify           Whether to verify SSL for the request. Default true.
+        *     @type string       sslcertificates      Absolute path to an SSL certificate .crt file.
+        *                                             Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'.
+        *     @type bool         $stream              Whether to stream to a file. If set to true and no filename was
+        *                                             given, it will be droped it in the WP temp dir and its name will
+        *                                             be set using the basename of the URL. Default false.
+        *     @type string       $filename            Filename of the file to write to when streaming. $stream must be
+        *                                             set to true. Default null.
+        *     @type int          $limit_response_size Size in bytes to limit the response to. Default null.
+        *
+        * }
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
+        *                        A WP_Error instance upon error.
         */
-       function request( $url, $args = array() ) {
+       public function request( $url, $args = array() ) {
                global $wp_version;
 
                $defaults = array(
                        'method' => 'GET',
-                       'timeout' => apply_filters( 'http_request_timeout', 5),
-                       'redirection' => apply_filters( 'http_request_redirection_count', 5),
-                       'httpversion' => apply_filters( 'http_request_version', '1.0'),
-                       'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )  ),
+                       /**
+                        * Filter the timeout value for an HTTP request.
+                        *
+                        * @since 2.7.0
+                        *
+                        * @param int $timeout_value Time in seconds until a request times out.
+                        *                           Default 5.
+                        */
+                       'timeout' => apply_filters( 'http_request_timeout', 5 ),
+                       /**
+                        * Filter the number of redirects allowed during an HTTP request.
+                        *
+                        * @since 2.7.0
+                        *
+                        * @param int $redirect_count Number of redirects allowed. Default 5.
+                        */
+                       'redirection' => apply_filters( 'http_request_redirection_count', 5 ),
+                       /**
+                        * Filter the version of the HTTP protocol used in a request.
+                        *
+                        * @since 2.7.0
+                        *
+                        * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'.
+                        *                        Default '1.0'.
+                        */
+                       'httpversion' => apply_filters( 'http_request_version', '1.0' ),
+                       /**
+                        * Filter the user agent value sent with an HTTP request.
+                        *
+                        * @since 2.7.0
+                        *
+                        * @param string $user_agent WordPress user agent string.
+                        */
+                       'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),
+                       /**
+                        * Filter whether to pass URLs through wp_http_validate_url() in an HTTP request.
+                        *
+                        * @since 3.6.0
+                        *
+                        * @param bool $pass_url Whether to pass URLs through wp_http_validate_url().
+                        *                       Default false.
+                        */
+                       'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),
                        'blocking' => true,
                        'headers' => array(),
                        'cookies' => array(),
                        'body' => null,
                        'compress' => false,
                        'decompress' => true,
-                       'sslverify' => true
+                       'sslverify' => true,
+                       'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt',
+                       'stream' => false,
+                       'filename' => null,
+                       'limit_response_size' => null,
                );
 
+               // Pre-parse for the HEAD checks.
+               $args = wp_parse_args( $args );
+
+               // By default, Head requests do not cause redirections.
+               if ( isset($args['method']) && 'HEAD' == $args['method'] )
+                       $defaults['redirection'] = 0;
+
                $r = wp_parse_args( $args, $defaults );
+               /**
+                * Filter the arguments used in an HTTP request.
+                *
+                * @since 2.7.0
+                *
+                * @param array  $r   An array of HTTP request arguments.
+                * @param string $url The request URL.
+                */
                $r = apply_filters( 'http_request_args', $r, $url );
 
-               // Allow plugins to short-circuit the request
+               // The transports decrement this, store a copy of the original value for loop purposes.
+               if ( ! isset( $r['_redirection'] ) )
+                       $r['_redirection'] = $r['redirection'];
+
+               /**
+                * Filter whether to preempt an HTTP request's return.
+                *
+                * Returning a truthy value to the filter will short-circuit
+                * the HTTP request and return early with that value.
+                *
+                * @since 2.9.0
+                *
+                * @param bool   $preempt Whether to preempt an HTTP request return. Default false.
+                * @param array  $r       HTTP request arguments.
+                * @param string $url     The request URL.
+                */
                $pre = apply_filters( 'pre_http_request', false, $r, $url );
                if ( false !== $pre )
                        return $pre;
 
-               $arrURL = parse_url( $url );
+               if ( function_exists( 'wp_kses_bad_protocol' ) ) {
+                       if ( $r['reject_unsafe_urls'] )
+                               $url = wp_http_validate_url( $url );
+                       $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
+               }
+
+               $arrURL = @parse_url( $url );
 
                if ( empty( $url ) || empty( $arrURL['scheme'] ) )
                        return new WP_Error('http_request_failed', __('A valid URL was not provided.'));
@@ -246,20 +193,39 @@ class WP_Http {
                if ( $this->block_request( $url ) )
                        return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) );
 
-               // Determine if this is a https call and pass that on to the transport functions
-               // so that we can blacklist the transports that do not support ssl verification
+               /*
+                * Determine if this is a https call and pass that on to the transport functions
+                * so that we can blacklist the transports that do not support ssl verification
+                */
                $r['ssl'] = $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl';
 
-               // Determine if this request is to OUR install of WordPress
+               // Determine if this request is to OUR install of WordPress.
                $homeURL = parse_url( get_bloginfo( 'url' ) );
-               $r['local'] = $homeURL['host'] == $arrURL['host'] || 'localhost' == $arrURL['host'];
+               $r['local'] = 'localhost' == $arrURL['host'] || ( isset( $homeURL['host'] ) && $homeURL['host'] == $arrURL['host'] );
                unset( $homeURL );
 
+               /*
+                * If we are streaming to a file but no filename was given drop it in the WP temp dir
+                * and pick its name using the basename of the $url.
+                */
+               if ( $r['stream']  && empty( $r['filename'] ) )
+                       $r['filename'] = get_temp_dir() . basename( $url );
+
+               /*
+                * Force some settings if we are streaming to a file and check for existence and perms
+                * of destination directory.
+                */
+               if ( $r['stream'] ) {
+                       $r['blocking'] = true;
+                       if ( ! wp_is_writable( dirname( $r['filename'] ) ) )
+                               return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );
+               }
+
                if ( is_null( $r['headers'] ) )
                        $r['headers'] = array();
 
                if ( ! is_array( $r['headers'] ) ) {
-                       $processedHeaders = WP_Http::processHeaders( $r['headers'] );
+                       $processedHeaders = WP_Http::processHeaders( $r['headers'], $url );
                        $r['headers'] = $processedHeaders['headers'];
                }
 
@@ -273,59 +239,150 @@ class WP_Http {
                        unset( $r['headers']['user-agent'] );
                }
 
-               // Construct Cookie: header if any cookies are set
+               if ( '1.1' == $r['httpversion'] && !isset( $r['headers']['connection'] ) ) {
+                       $r['headers']['connection'] = 'close';
+               }
+
+               // Construct Cookie: header if any cookies are set.
                WP_Http::buildCookieHeader( $r );
 
-               if ( WP_Http_Encoding::is_available() )
-                       $r['headers']['Accept-Encoding'] = WP_Http_Encoding::accept_encoding();
-
-               if ( empty($r['body']) ) {
-                       $r['body'] = null;
-                       // Some servers fail when sending content without the content-length header being set.
-                       // Also, to fix another bug, we only send when doing POST and PUT and the content-length
-                       // header isn't already set.
-                       if ( ($r['method'] == 'POST' || $r['method'] == 'PUT') && ! isset( $r['headers']['Content-Length'] ) )
-                               $r['headers']['Content-Length'] = 0;
-
-                       // The method is ambiguous, because we aren't talking about HTTP methods, the "get" in
-                       // this case is simply that we aren't sending any bodies and to get the transports that
-                       // don't support sending bodies along with those which do.
-                       $transports = WP_Http::_getTransport( $r );
-               } else {
+               // Avoid issues where mbstring.func_overload is enabled.
+               mbstring_binary_safe_encoding();
+
+               if ( ! isset( $r['headers']['Accept-Encoding'] ) ) {
+                       if ( $encoding = WP_Http_Encoding::accept_encoding( $url, $r ) )
+                               $r['headers']['Accept-Encoding'] = $encoding;
+               }
+
+               if ( ( ! is_null( $r['body'] ) && '' != $r['body'] ) || 'POST' == $r['method'] || 'PUT' == $r['method'] ) {
                        if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {
-                               if ( ! version_compare(phpversion(), '5.1.2', '>=') )
-                                       $r['body'] = _http_build_query( $r['body'], null, '&' );
-                               else
-                                       $r['body'] = http_build_query( $r['body'], null, '&' );
-                               $r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' );
-                               $r['headers']['Content-Length'] = strlen( $r['body'] );
+                               $r['body'] = http_build_query( $r['body'], null, '&' );
+
+                               if ( ! isset( $r['headers']['Content-Type'] ) )
+                                       $r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' );
                        }
 
+                       if ( '' === $r['body'] )
+                               $r['body'] = null;
+
                        if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) )
                                $r['headers']['Content-Length'] = strlen( $r['body'] );
-
-                       // The method is ambiguous, because we aren't talking about HTTP methods, the "post" in
-                       // this case is simply that we are sending HTTP body and to get the transports that do
-                       // support sending the body. Not all do, depending on the limitations of the PHP core
-                       // limitations.
-                       $transports = WP_Http::_postTransport( $r );
                }
 
-               do_action( 'http_api_debug', $transports, 'transports_list' );
+               $response = $this->_dispatch_request( $url, $r );
 
-               $response = array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
-               foreach ( (array) $transports as $transport ) {
-                       $response = $transport->request( $url, $r );
+               reset_mbstring_encoding();
 
-                       do_action( 'http_api_debug', $response, 'response', get_class( $transport ) );
+               if ( is_wp_error( $response ) )
+                       return $response;
 
-                       if ( ! is_wp_error( $response ) )
-                               return apply_filters( 'http_response', $response, $r, $url );
+               // Append cookies that were used in this request to the response
+               if ( ! empty( $r['cookies'] ) ) {
+                       $cookies_set = wp_list_pluck( $response['cookies'], 'name' );
+                       foreach ( $r['cookies'] as $cookie ) {
+                               if ( ! in_array( $cookie->name, $cookies_set ) && $cookie->test( $url ) ) {
+                                       $response['cookies'][] = $cookie;
+                               }
+                       }
                }
 
                return $response;
        }
 
+       /**
+        * Tests which transports are capable of supporting the request.
+        *
+        * @since 3.2.0
+        * @access private
+        *
+        * @param array $args Request arguments
+        * @param string $url URL to Request
+        *
+        * @return string|bool Class name for the first transport that claims to support the request. False if no transport claims to support the request.
+        */
+       public function _get_first_available_transport( $args, $url = null ) {
+               /**
+                * Filter which HTTP transports are available and in what order.
+                *
+                * @since 3.7.0
+                *
+                * @param array  $value Array of HTTP transports to check. Default array contains
+                *                      'curl', and 'streams', in that order.
+                * @param array  $args  HTTP request arguments.
+                * @param string $url   The URL to request.
+                */
+               $request_order = apply_filters( 'http_api_transports', array( 'curl', 'streams' ), $args, $url );
+
+               // Loop over each transport on each HTTP request looking for one which will serve this request's needs.
+               foreach ( $request_order as $transport ) {
+                       $class = 'WP_HTTP_' . $transport;
+
+                       // Check to see if this transport is a possibility, calls the transport statically.
+                       if ( !call_user_func( array( $class, 'test' ), $args, $url ) )
+                               continue;
+
+                       return $class;
+               }
+
+               return false;
+       }
+
+       /**
+        * Dispatches a HTTP request to a supporting transport.
+        *
+        * Tests each transport in order to find a transport which matches the request arguments.
+        * Also caches the transport instance to be used later.
+        *
+        * The order for requests is cURL, and then PHP Streams.
+        *
+        * @since 3.2.0
+        * @access private
+        *
+        * @param string $url URL to Request
+        * @param array $args Request arguments
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
+        */
+       private function _dispatch_request( $url, $args ) {
+               static $transports = array();
+
+               $class = $this->_get_first_available_transport( $args, $url );
+               if ( !$class )
+                       return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );
+
+               // Transport claims to support request, instantiate it and give it a whirl.
+               if ( empty( $transports[$class] ) )
+                       $transports[$class] = new $class;
+
+               $response = $transports[$class]->request( $url, $args );
+
+               /**
+                * Fires after an HTTP API response is received and before the response is returned.
+                *
+                * @since 2.8.0
+                *
+                * @param array|WP_Error $response HTTP response or WP_Error object.
+                * @param string         $context  Context under which the hook is fired.
+                * @param string         $class    HTTP transport used.
+                * @param array          $args     HTTP request arguments.
+                * @param string         $url      The request URL.
+                */
+               do_action( 'http_api_debug', $response, 'response', $class, $args, $url );
+
+               if ( is_wp_error( $response ) )
+                       return $response;
+
+               /**
+                * Filter the HTTP API response immediately before the response is returned.
+                *
+                * @since 2.9.0
+                *
+                * @param array  $response HTTP response.
+                * @param array  $args     HTTP request arguments.
+                * @param string $url      The request URL.
+                */
+               return apply_filters( 'http_response', $response, $args, $url );
+       }
+
        /**
         * Uses the POST HTTP method.
         *
@@ -334,11 +391,11 @@ class WP_Http {
         * @access public
         * @since 2.7.0
         *
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return boolean
+        * @param string       $url  The request URL.
+        * @param string|array $args Optional. Override the defaults.
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
         */
-       function post($url, $args = array()) {
+       public function post($url, $args = array()) {
                $defaults = array('method' => 'POST');
                $r = wp_parse_args( $args, $defaults );
                return $this->request($url, $r);
@@ -352,11 +409,11 @@ class WP_Http {
         * @access public
         * @since 2.7.0
         *
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return boolean
+        * @param string $url The request URL.
+        * @param string|array $args Optional. Override the defaults.
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
         */
-       function get($url, $args = array()) {
+       public function get($url, $args = array()) {
                $defaults = array('method' => 'GET');
                $r = wp_parse_args( $args, $defaults );
                return $this->request($url, $r);
@@ -370,11 +427,11 @@ class WP_Http {
         * @access public
         * @since 2.7.0
         *
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return boolean
+        * @param string $url The request URL.
+        * @param string|array $args Optional. Override the defaults.
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
         */
-       function head($url, $args = array()) {
+       public function head($url, $args = array()) {
                $defaults = array('method' => 'HEAD');
                $r = wp_parse_args( $args, $defaults );
                return $this->request($url, $r);
@@ -390,10 +447,10 @@ class WP_Http {
         * @param string $strResponse The full response string
         * @return array Array with 'headers' and 'body' keys.
         */
-       function processResponse($strResponse) {
+       public static function processResponse($strResponse) {
                $res = explode("\r\n\r\n", $strResponse, 2);
 
-               return array('headers' => isset($res[0]) ? $res[0] : array(), 'body' => isset($res[1]) ? $res[1] : '');
+               return array('headers' => $res[0], 'body' => isset($res[1]) ? $res[1] : '');
        }
 
        /**
@@ -407,24 +464,30 @@ class WP_Http {
         * @since 2.7.0
         *
         * @param string|array $headers
+        * @param string $url The URL that was requested
         * @return array Processed string headers. If duplicate headers are encountered,
         *                                      Then a numbered array is returned as the value of that header-key.
         */
-       function processHeaders($headers) {
-               // split headers, one per array element
+       public static function processHeaders( $headers, $url = '' ) {
+               // Split headers, one per array element.
                if ( is_string($headers) ) {
-                       // tolerate line terminator: CRLF = LF (RFC 2616 19.3)
+                       // Tolerate line terminator: CRLF = LF (RFC 2616 19.3).
                        $headers = str_replace("\r\n", "\n", $headers);
-                       // unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>, <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2)
+                       /*
+                        * Unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>,
+                        * <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2).
+                        */
                        $headers = preg_replace('/\n[ \t]/', ' ', $headers);
-                       // create the headers array
+                       // Create the headers array.
                        $headers = explode("\n", $headers);
                }
 
                $response = array('code' => 0, 'message' => '');
 
-               // If a redirection has taken place, The headers for each page request may have been passed.
-               // In this case, determine the final HTTP header and parse from there.
+               /*
+                * If a redirection has taken place, The headers for each page request may have been passed.
+                * In this case, determine the final HTTP header and parse from there.
+                */
                for ( $i = count($headers)-1; $i >= 0; $i-- ) {
                        if ( !empty($headers[$i]) && false === strpos($headers[$i], ':') ) {
                                $headers = array_splice($headers, $i);
@@ -434,29 +497,31 @@ class WP_Http {
 
                $cookies = array();
                $newheaders = array();
-               foreach ( $headers as $tempheader ) {
+               foreach ( (array) $headers as $tempheader ) {
                        if ( empty($tempheader) )
                                continue;
 
                        if ( false === strpos($tempheader, ':') ) {
-                               list( , $response['code'], $response['message']) = explode(' ', $tempheader, 3);
+                               $stack = explode(' ', $tempheader, 3);
+                               $stack[] = '';
+                               list( , $response['code'], $response['message']) = $stack;
                                continue;
                        }
 
                        list($key, $value) = explode(':', $tempheader, 2);
 
-                       if ( !empty( $value ) ) {
-                               $key = strtolower( $key );
-                               if ( isset( $newheaders[$key] ) ) {
-                                       if ( !is_array($newheaders[$key]) )
-                                               $newheaders[$key] = array($newheaders[$key]);
-                                       $newheaders[$key][] = trim( $value );
-                               } else {
-                                       $newheaders[$key] = trim( $value );
-                               }
-                               if ( 'set-cookie' == $key )
-                                       $cookies[] = new WP_Http_Cookie( $value );
+                       $key = strtolower( $key );
+                       $value = trim( $value );
+
+                       if ( isset( $newheaders[ $key ] ) ) {
+                               if ( ! is_array( $newheaders[ $key ] ) )
+                                       $newheaders[$key] = array( $newheaders[ $key ] );
+                               $newheaders[ $key ][] = $value;
+                       } else {
+                               $newheaders[ $key ] = $value;
                        }
+                       if ( 'set-cookie' == $key )
+                               $cookies[] = new WP_Http_Cookie( $value, $url );
                }
 
                return array('response' => $response, 'headers' => $newheaders, 'cookies' => $cookies);
@@ -465,9 +530,9 @@ class WP_Http {
        /**
         * Takes the arguments for a ::request() and checks for the cookie array.
         *
-        * If it's found, then it's assumed to contain WP_Http_Cookie objects, which are each parsed
-        * into strings and added to the Cookie: header (within the arguments array). Edits the array by
-        * reference.
+        * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,
+        * which are each parsed into strings and added to the Cookie: header (within the arguments array).
+        * Edits the array by reference.
         *
         * @access public
         * @version 2.8.0
@@ -475,12 +540,19 @@ class WP_Http {
         *
         * @param array $r Full array of args passed into ::request()
         */
-       function buildCookieHeader( &$r ) {
+       public static function buildCookieHeader( &$r ) {
                if ( ! empty($r['cookies']) ) {
+                       // Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances.
+                       foreach ( $r['cookies'] as $name => $value ) {
+                               if ( ! is_object( $value ) )
+                                       $r['cookies'][ $name ] = new WP_HTTP_Cookie( array( 'name' => $name, 'value' => $value ) );
+                       }
+
                        $cookies_header = '';
                        foreach ( (array) $r['cookies'] as $cookie ) {
                                $cookies_header .= $cookie->getHeaderValue() . '; ';
                        }
+
                        $cookies_header = substr( $cookies_header, 0, -2 );
                        $r['headers']['cookie'] = $cookies_header;
                }
@@ -489,10 +561,10 @@ class WP_Http {
        /**
         * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.
         *
-        * Based off the HTTP http_encoding_dechunk function. Does not support UTF-8. Does not support
-        * returning footer headers. Shouldn't be too difficult to support it though.
+        * Based off the HTTP http_encoding_dechunk function.
+        *
+        * @link http://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.
         *
-        * @todo Add support for footer chunked headers.
         * @access public
         * @since 2.7.0
         * @static
@@ -500,35 +572,33 @@ class WP_Http {
         * @param string $body Body content
         * @return string Chunked decoded body on success or raw body on failure.
         */
-       function chunkTransferDecode($body) {
-               $body = str_replace(array("\r\n", "\r"), "\n", $body);
-               // The body is not chunked encoding or is malformed.
-               if ( ! preg_match( '/^[0-9a-f]+(\s|\n)+/mi', trim($body) ) )
+       public static function chunkTransferDecode( $body ) {
+               // The body is not chunked encoded or is malformed.
+               if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) )
                        return $body;
 
-               $parsedBody = '';
-               //$parsedHeaders = array(); Unsupported
+               $parsed_body = '';
 
-               while ( true ) {
-                       $hasChunk = (bool) preg_match( '/^([0-9a-f]+)(\s|\n)+/mi', $body, $match );
+               // We'll be altering $body, so need a backup in case of error.
+               $body_original = $body;
 
-                       if ( $hasChunk ) {
-                               if ( empty( $match[1] ) )
-                                       return $body;
+               while ( true ) {
+                       $has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );
+                       if ( ! $has_chunk || empty( $match[1] ) )
+                               return $body_original;
 
-                               $length = hexdec( $match[1] );
-                               $chunkLength = strlen( $match[0] );
+                       $length = hexdec( $match[1] );
+                       $chunk_length = strlen( $match[0] );
 
-                               $strBody = substr($body, $chunkLength, $length);
-                               $parsedBody .= $strBody;
+                       // Parse out the chunk of data.
+                       $parsed_body .= substr( $body, $chunk_length, $length );
 
-                               $body = ltrim(str_replace(array($match[0], $strBody), '', $body), "\n");
+                       // Remove the chunk from the raw data.
+                       $body = substr( $body, $length + $chunk_length );
 
-                               if ( "0" == trim($body) )
-                                       return $parsedBody; // Ignore footer headers.
-                       } else {
-                               return $body;
-                       }
+                       // End of the document.
+                       if ( '0' === trim( $body ) )
+                               return $parsed_body;
                }
        }
 
@@ -551,30 +621,29 @@ class WP_Http {
         * @param string $uri URI of url.
         * @return bool True to block, false to allow.
         */
-       function block_request($uri) {
+       public function block_request($uri) {
                // We don't need to block requests, because nothing is blocked.
                if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL )
                        return false;
 
-               // parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
-               // This will be displayed on blogs, which is not reasonable.
-               $check = @parse_url($uri);
-
-               /* Malformed URL, can not process, but this could mean ssl, so let through anyway.
-                *
-                * This isn't very security sound. There are instances where a hacker might attempt
-                * to bypass the proxy and this check. However, the reason for this behavior is that
-                * WordPress does not do any checking currently for non-proxy requests, so it is keeps with
-                * the default unsecure nature of the HTTP request.
-                */
-               if ( $check === false )
-                       return false;
+               $check = parse_url($uri);
+               if ( ! $check )
+                       return true;
 
                $home = parse_url( get_option('siteurl') );
 
-               // Don't block requests back to ourselves by default
-               if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )
-                       return apply_filters('block_local_requests', false);
+               // Don't block requests back to ourselves by default.
+               if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) {
+                       /**
+                        * Filter whether to block local requests through the proxy.
+                        *
+                        * @since 2.8.0
+                        *
+                        * @param bool $block Whether to block local requests through proxy.
+                        *                    Default false.
+                        */
+                       return apply_filters( 'block_local_requests', false );
+               }
 
                if ( !defined('WP_ACCESSIBLE_HOSTS') )
                        return true;
@@ -587,7 +656,7 @@ class WP_Http {
                        if ( false !== strpos(WP_ACCESSIBLE_HOSTS, '*') ) {
                                $wildcard_regex = array();
                                foreach ( $accessible_hosts as $host )
-                                       $wildcard_regex[] = str_replace('\*', '[\w.]+?', preg_quote($host, '/'));
+                                       $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
                                $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';
                        }
                }
@@ -595,390 +664,156 @@ class WP_Http {
                if ( !empty($wildcard_regex) )
                        return !preg_match($wildcard_regex, $check['host']);
                else
-                       return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If its in the array, then we can't access it.
-
-
+                       return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it.
 
        }
-}
-
-/**
- * HTTP request method uses fsockopen function to retrieve the url.
- *
- * This would be the preferred method, but the fsockopen implementation has the most overhead of all
- * the HTTP transport implementations.
- *
- * @package WordPress
- * @subpackage HTTP
- * @since 2.7.0
- */
-class WP_Http_Fsockopen {
-       /**
-        * Send a HTTP request to a URI using fsockopen().
-        *
-        * Does not support non-blocking mode.
-        *
-        * @see WP_Http::request For default options descriptions.
-        *
-        * @since 2.7
-        * @access public
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return array 'headers', 'body', 'cookies' and 'response' keys.
-        */
-       function request($url, $args = array()) {
-               $defaults = array(
-                       'method' => 'GET', 'timeout' => 5,
-                       'redirection' => 5, 'httpversion' => '1.0',
-                       'blocking' => true,
-                       'headers' => array(), 'body' => null, 'cookies' => array()
-               );
-
-               $r = wp_parse_args( $args, $defaults );
-
-               if ( isset($r['headers']['User-Agent']) ) {
-                       $r['user-agent'] = $r['headers']['User-Agent'];
-                       unset($r['headers']['User-Agent']);
-               } else if ( isset($r['headers']['user-agent']) ) {
-                       $r['user-agent'] = $r['headers']['user-agent'];
-                       unset($r['headers']['user-agent']);
-               }
-
-               // Construct Cookie: header if any cookies are set
-               WP_Http::buildCookieHeader( $r );
-
-               $iError = null; // Store error number
-               $strError = null; // Store error string
-
-               $arrURL = parse_url($url);
-
-               $fsockopen_host = $arrURL['host'];
-
-               $secure_transport = false;
-
-               if ( ! isset( $arrURL['port'] ) ) {
-                       if ( ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) && extension_loaded('openssl') ) {
-                               $fsockopen_host = "ssl://$fsockopen_host";
-                               $arrURL['port'] = 443;
-                               $secure_transport = true;
-                       } else {
-                               $arrURL['port'] = 80;
-                       }
-               }
-
-               //fsockopen has issues with 'localhost' with IPv6 with certain versions of PHP, It attempts to connect to ::1,
-               // which fails when the server is not set up for it. For compatibility, always connect to the IPv4 address.
-               if ( 'localhost' == strtolower($fsockopen_host) )
-                       $fsockopen_host = '127.0.0.1';
-
-               // There are issues with the HTTPS and SSL protocols that cause errors that can be safely
-               // ignored and should be ignored.
-               if ( true === $secure_transport )
-                       $error_reporting = error_reporting(0);
-
-               $startDelay = time();
-
-               $proxy = new WP_HTTP_Proxy();
-
-               if ( !WP_DEBUG ) {
-                       if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
-                               $handle = @fsockopen( $proxy->host(), $proxy->port(), $iError, $strError, $r['timeout'] );
-                       else
-                               $handle = @fsockopen( $fsockopen_host, $arrURL['port'], $iError, $strError, $r['timeout'] );
-               } else {
-                       if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
-                               $handle = fsockopen( $proxy->host(), $proxy->port(), $iError, $strError, $r['timeout'] );
-                       else
-                               $handle = fsockopen( $fsockopen_host, $arrURL['port'], $iError, $strError, $r['timeout'] );
-               }
-
-               $endDelay = time();
-
-               // If the delay is greater than the timeout then fsockopen should't be used, because it will
-               // cause a long delay.
-               $elapseDelay = ($endDelay-$startDelay) > $r['timeout'];
-               if ( true === $elapseDelay )
-                       add_option( 'disable_fsockopen', $endDelay, null, true );
-
-               if ( false === $handle )
-                       return new WP_Error('http_request_failed', $iError . ': ' . $strError);
-
-               $timeout = (int) floor( $r['timeout'] );
-               $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
-               stream_set_timeout( $handle, $timeout, $utimeout );
-
-               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.
-                       $requestPath = $url;
-               else
-                       $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );
-
-               if ( empty($requestPath) )
-                       $requestPath .= '/';
-
-               $strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";
-
-               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
-                       $strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";
-               else
-                       $strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";
-
-               if ( isset($r['user-agent']) )
-                       $strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";
-
-               if ( is_array($r['headers']) ) {
-                       foreach ( (array) $r['headers'] as $header => $headerValue )
-                               $strHeaders .= $header . ': ' . $headerValue . "\r\n";
-               } else {
-                       $strHeaders .= $r['headers'];
-               }
 
-               if ( $proxy->use_authentication() )
-                       $strHeaders .= $proxy->authentication_header() . "\r\n";
+       public static function make_absolute_url( $maybe_relative_path, $url ) {
+               if ( empty( $url ) )
+                       return $maybe_relative_path;
 
-               $strHeaders .= "\r\n";
-
-               if ( ! is_null($r['body']) )
-                       $strHeaders .= $r['body'];
+               // Check for a scheme.
+               if ( false !== strpos( $maybe_relative_path, '://' ) )
+                       return $maybe_relative_path;
 
-               fwrite($handle, $strHeaders);
+               if ( ! $url_parts = @parse_url( $url ) )
+                       return $maybe_relative_path;
 
-               if ( ! $r['blocking'] ) {
-                       fclose($handle);
-                       return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
-               }
+               if ( ! $relative_url_parts = @parse_url( $maybe_relative_path ) )
+                       return $maybe_relative_path;
 
-               $strResponse = '';
-               while ( ! feof($handle) )
-                       $strResponse .= fread($handle, 4096);
+               $absolute_path = $url_parts['scheme'] . '://' . $url_parts['host'];
+               if ( isset( $url_parts['port'] ) )
+                       $absolute_path .= ':' . $url_parts['port'];
 
-               fclose($handle);
+               // Start off with the Absolute URL path.
+               $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';
 
-               if ( true === $secure_transport )
-                       error_reporting($error_reporting);
+               // If it's a root-relative path, then great.
+               if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) {
+                       $path = $relative_url_parts['path'];
 
-               $process = WP_Http::processResponse($strResponse);
-               $arrHeaders = WP_Http::processHeaders($process['headers']);
+               // Else it's a relative path.
+               } elseif ( ! empty( $relative_url_parts['path'] ) ) {
+                       // Strip off any file components from the absolute path.
+                       $path = substr( $path, 0, strrpos( $path, '/' ) + 1 );
 
-               // Is the response code within the 400 range?
-               if ( (int) $arrHeaders['response']['code'] >= 400 && (int) $arrHeaders['response']['code'] < 500 )
-                       return new WP_Error('http_request_failed', $arrHeaders['response']['code'] . ': ' . $arrHeaders['response']['message']);
+                       // Build the new path.
+                       $path .= $relative_url_parts['path'];
 
-               // If location is found, then assume redirect and redirect to location.
-               if ( 'HEAD' != $r['method'] && isset($arrHeaders['headers']['location']) ) {
-                       if ( $r['redirection']-- > 0 ) {
-                               return $this->request($arrHeaders['headers']['location'], $r);
-                       } else {
-                               return new WP_Error('http_request_failed', __('Too many redirects.'));
+                       // Strip all /path/../ out of the path.
+                       while ( strpos( $path, '../' ) > 1 ) {
+                               $path = preg_replace( '![^/]+/\.\./!', '', $path );
                        }
-               }
-
-               // If the body was chunk encoded, then decode it.
-               if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )
-                       $process['body'] = WP_Http::chunkTransferDecode($process['body']);
-
-               if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )
-                       $process['body'] = WP_Http_Encoding::decompress( $process['body'] );
-
-               return array('headers' => $arrHeaders['headers'], 'body' => $process['body'], 'response' => $arrHeaders['response'], 'cookies' => $arrHeaders['cookies']);
-       }
-
-       /**
-        * Whether this class can be used for retrieving an URL.
-        *
-        * @since 2.7.0
-        * @static
-        * @return boolean False means this class can not be used, true means it can.
-        */
-       function test( $args = array() ) {
-               if ( false !== ($option = get_option( 'disable_fsockopen' )) && time()-$option < 43200 ) // 12 hours
-                       return false;
 
-               $is_ssl = isset($args['ssl']) && $args['ssl'];
+                       // Strip any final leading ../ from the path.
+                       $path = preg_replace( '!^/(\.\./)+!', '', $path );
+               }
 
-               if ( ! $is_ssl && function_exists( 'fsockopen' ) )
-                       $use = true;
-               elseif ( $is_ssl && extension_loaded('openssl') && function_exists( 'fsockopen' ) )
-                       $use = true;
-               else
-                       $use = false;
+               // Add the Query string.
+               if ( ! empty( $relative_url_parts['query'] ) )
+                       $path .= '?' . $relative_url_parts['query'];
 
-               return apply_filters('use_fsockopen_transport', $use, $args);
+               return $absolute_path . '/' . ltrim( $path, '/' );
        }
-}
 
-/**
- * HTTP request method uses fopen function to retrieve the url.
- *
- * Requires PHP version greater than 4.3.0 for stream support. Does not allow for $context support,
- * but should still be okay, to write the headers, before getting the response. Also requires that
- * 'allow_url_fopen' to be enabled.
- *
- * @package WordPress
- * @subpackage HTTP
- * @since 2.7.0
- */
-class WP_Http_Fopen {
        /**
-        * Send a HTTP request to a URI using fopen().
-        *
-        * This transport does not support sending of headers and body, therefore should not be used in
-        * the instances, where there is a body and headers.
+        * Handles HTTP Redirects and follows them if appropriate.
         *
-        * Notes: Does not support non-blocking mode. Ignores 'redirection' option.
+        * @since 3.7.0
         *
-        * @see WP_Http::retrieve For default options descriptions.
-        *
-        * @access public
-        * @since 2.7.0
-        *
-        * @param string $url URI resource.
-        * @param str|array $args Optional. Override the defaults.
-        * @return array 'headers', 'body', 'cookies' and 'response' keys.
+        * @param string $url The URL which was requested.
+        * @param array $args The Arguments which were used to make the request.
+        * @param array $response The Response of the HTTP request.
+        * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.
         */
-       function request($url, $args = array()) {
-               $defaults = array(
-                       'method' => 'GET', 'timeout' => 5,
-                       'redirection' => 5, 'httpversion' => '1.0',
-                       'blocking' => true,
-                       'headers' => array(), 'body' => null, 'cookies' => array()
-               );
-
-               $r = wp_parse_args( $args, $defaults );
-
-               $arrURL = parse_url($url);
-
-               if ( false === $arrURL )
-                       return new WP_Error('http_request_failed', sprintf(__('Malformed URL: %s'), $url));
-
-               if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
-                       $url = str_replace($arrURL['scheme'], 'http', $url);
-
-               if ( is_null( $r['headers'] ) )
-                       $r['headers'] = array();
-
-               if ( is_string($r['headers']) ) {
-                       $processedHeaders = WP_Http::processHeaders($r['headers']);
-                       $r['headers'] = $processedHeaders['headers'];
-               }
+       public static function handle_redirects( $url, $args, $response ) {
+               // If no redirects are present, or, redirects were not requested, perform no action.
+               if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] )
+                       return false;
 
-               $initial_user_agent = ini_get('user_agent');
+               // Only perform redirections on redirection http codes.
+               if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 )
+                       return false;
 
-               if ( !empty($r['headers']) && is_array($r['headers']) ) {
-                       $user_agent_extra_headers = '';
-                       foreach ( $r['headers'] as $header => $value )
-                               $user_agent_extra_headers .= "\r\n$header: $value";
-                       @ini_set('user_agent', $r['user-agent'] . $user_agent_extra_headers);
-               } else {
-                       @ini_set('user_agent', $r['user-agent']);
-               }
+               // Don't redirect if we've run out of redirects.
+               if ( $args['redirection']-- <= 0 )
+                       return new WP_Error( 'http_request_failed', __('Too many redirects.') );
 
-               if ( !WP_DEBUG )
-                       $handle = @fopen($url, 'r');
-               else
-                       $handle = fopen($url, 'r');
+               $redirect_location = $response['headers']['location'];
 
-               if (! $handle)
-                       return new WP_Error('http_request_failed', sprintf(__('Could not open handle for fopen() to %s'), $url));
+               // If there were multiple Location headers, use the last header specified.
+               if ( is_array( $redirect_location ) )
+                       $redirect_location = array_pop( $redirect_location );
 
-               $timeout = (int) floor( $r['timeout'] );
-               $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
-               stream_set_timeout( $handle, $timeout, $utimeout );
+               $redirect_location = WP_HTTP::make_absolute_url( $redirect_location, $url );
 
-               if ( ! $r['blocking'] ) {
-                       fclose($handle);
-                       @ini_set('user_agent', $initial_user_agent); //Clean up any extra headers added
-                       return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
+               // POST requests should not POST to a redirected location.
+               if ( 'POST' == $args['method'] ) {
+                       if ( in_array( $response['response']['code'], array( 302, 303 ) ) )
+                               $args['method'] = 'GET';
                }
 
-               $strResponse = '';
-               while ( ! feof($handle) )
-                       $strResponse .= fread($handle, 4096);
-
-               if ( function_exists('stream_get_meta_data') ) {
-                       $meta = stream_get_meta_data($handle);
-
-                       $theHeaders = $meta['wrapper_data'];
-                       if ( isset( $meta['wrapper_data']['headers'] ) )
-                               $theHeaders = $meta['wrapper_data']['headers'];
-               } else {
-                       //$http_response_header is a PHP reserved variable which is set in the current-scope when using the HTTP Wrapper
-                       //see http://php.oregonstate.edu/manual/en/reserved.variables.httpresponseheader.php
-                       $theHeaders = $http_response_header;
+               // Include valid cookies in the redirect process.
+               if ( ! empty( $response['cookies'] ) ) {
+                       foreach ( $response['cookies'] as $cookie ) {
+                               if ( $cookie->test( $redirect_location ) )
+                                       $args['cookies'][] = $cookie;
+                       }
                }
 
-               fclose($handle);
-
-               @ini_set('user_agent', $initial_user_agent); //Clean up any extra headers added
-
-               $processedHeaders = WP_Http::processHeaders($theHeaders);
-
-               if ( ! empty( $strResponse ) && isset( $processedHeaders['headers']['transfer-encoding'] ) && 'chunked' == $processedHeaders['headers']['transfer-encoding'] )
-                       $strResponse = WP_Http::chunkTransferDecode($strResponse);
-
-               if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($processedHeaders['headers']) )
-                       $strResponse = WP_Http_Encoding::decompress( $strResponse );
-
-               return array('headers' => $processedHeaders['headers'], 'body' => $strResponse, 'response' => $processedHeaders['response'], 'cookies' => $processedHeaders['cookies']);
+               return wp_remote_request( $redirect_location, $args );
        }
 
        /**
-        * Whether this class can be used for retrieving an URL.
+        * Determines if a specified string represents an IP address or not.
         *
-        * @since 2.7.0
+        * This function also detects the type of the IP address, returning either
+        * '4' or '6' to represent a IPv4 and IPv6 address respectively.
+        * This does not verify if the IP is a valid IP, only that it appears to be
+        * an IP address.
+        *
+        * @see http://home.deds.nl/~aeron/regex/ for IPv6 regex
+        *
+        * @since 3.7.0
         * @static
-        * @return boolean False means this class can not be used, true means it can.
+        *
+        * @param string $maybe_ip A suspected IP address
+        * @return integer|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure
         */
-       function test($args = array()) {
-               if ( ! function_exists('fopen') || (function_exists('ini_get') && true != ini_get('allow_url_fopen')) )
-                       return false;
-
-               if ( isset($args['method']) && 'HEAD' == $args['method'] ) //This transport cannot make a HEAD request
-                       return false;
+       public static function is_ip_address( $maybe_ip ) {
+               if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) )
+                       return 4;
 
-               $use = true;
-               //PHP does not verify SSL certs, We can only make a request via this transports if SSL Verification is turned off.
-               $is_ssl = isset($args['ssl']) && $args['ssl'];
-               if ( $is_ssl ) {
-                       $is_local = isset($args['local']) && $args['local'];
-                       $ssl_verify = isset($args['sslverify']) && $args['sslverify'];
-                       if ( $is_local && true != apply_filters('https_local_ssl_verify', true) )
-                               $use = true;
-                       elseif ( !$is_local && true != apply_filters('https_ssl_verify', true) )
-                               $use = true;
-                       elseif ( !$ssl_verify )
-                               $use = true;
-                       else
-                               $use = false;
-               }
+               if ( false !== strpos( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) )
+                       return 6;
 
-               return apply_filters('use_fopen_transport', $use, $args);
+               return false;
        }
+
 }
 
 /**
- * HTTP request method uses Streams to retrieve the url.
- *
- * Requires PHP 5.0+ and uses fopen with stream context. Requires that 'allow_url_fopen' PHP setting
- * to be enabled.
- *
- * Second preferred method for getting the URL, for PHP 5.
+ * HTTP request method uses PHP Streams to retrieve the url.
  *
- * @package WordPress
- * @subpackage HTTP
  * @since 2.7.0
+ * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
  */
 class WP_Http_Streams {
        /**
-        * Send a HTTP request to a URI using streams with fopen().
+        * Send a HTTP request to a URI using PHP Streams.
+        *
+        * @see WP_Http::request For default options descriptions.
         *
-        * @access public
         * @since 2.7.0
+        * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
         *
-        * @param string $url
-        * @param str|array $args Optional. Override the defaults.
-        * @return array 'headers', 'body', 'cookies' and 'response' keys.
+        * @access public
+        * @param string $url The request URL.
+        * @param string|array $args Optional. Override the defaults.
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
         */
-       function request($url, $args = array()) {
+       public function request($url, $args = array()) {
                $defaults = array(
                        'method' => 'GET', 'timeout' => 5,
                        'redirection' => 5, 'httpversion' => '1.0',
@@ -996,290 +831,376 @@ class WP_Http_Streams {
                        unset($r['headers']['user-agent']);
                }
 
-               // Construct Cookie: header if any cookies are set
+               // Construct Cookie: header if any cookies are set.
                WP_Http::buildCookieHeader( $r );
 
                $arrURL = parse_url($url);
 
-               if ( false === $arrURL )
-                       return new WP_Error('http_request_failed', sprintf(__('Malformed URL: %s'), $url));
-
-               if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
-                       $url = preg_replace('|^' . preg_quote($arrURL['scheme'], '|') . '|', 'http', $url);
-
-               // Convert Header array to string.
-               $strHeaders = '';
-               if ( is_array( $r['headers'] ) )
-                       foreach ( $r['headers'] as $name => $value )
-                               $strHeaders .= "{$name}: $value\r\n";
-               else if ( is_string( $r['headers'] ) )
-                       $strHeaders = $r['headers'];
-
-               $is_local = isset($args['local']) && $args['local'];
-               $ssl_verify = isset($args['sslverify']) && $args['sslverify'];
-               if ( $is_local )
-                       $ssl_verify = apply_filters('https_local_ssl_verify', $ssl_verify);
-               elseif ( ! $is_local )
-                       $ssl_verify = apply_filters('https_ssl_verify', $ssl_verify);
-
-               $arrContext = array('http' =>
-                       array(
-                               'method' => strtoupper($r['method']),
-                               'user_agent' => $r['user-agent'],
-                               'max_redirects' => $r['redirection'] + 1, // See #11557
-                               'protocol_version' => (float) $r['httpversion'],
-                               'header' => $strHeaders,
-                               'ignore_errors' => true, // Return non-200 requests.
-                               'timeout' => $r['timeout'],
-                               'ssl' => array(
-                                               'verify_peer' => $ssl_verify,
-                                               'verify_host' => $ssl_verify
-                               )
-                       )
-               );
-
-               $proxy = new WP_HTTP_Proxy();
+               $connect_host = $arrURL['host'];
 
-               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
-                       $arrContext['http']['proxy'] = 'tcp://' . $proxy->host() . ':' . $proxy->port();
-                       $arrContext['http']['request_fulluri'] = true;
+               $secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' );
+               if ( ! isset( $arrURL['port'] ) ) {
+                       if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) {
+                               $arrURL['port'] = 443;
+                               $secure_transport = true;
+                       } else {
+                               $arrURL['port'] = 80;
+                       }
+               }
 
-                       // We only support Basic authentication so this will only work if that is what your proxy supports.
-                       if ( $proxy->use_authentication() )
-                               $arrContext['http']['header'] .= $proxy->authentication_header() . "\r\n";
+               if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) {
+                       if ( isset( $r['headers']['Host'] ) )
+                               $arrURL['host'] = $r['headers']['Host'];
+                       else
+                               $arrURL['host'] = $r['headers']['host'];
+                       unset( $r['headers']['Host'], $r['headers']['host'] );
                }
 
-               if ( 'HEAD' == $r['method'] ) // Disable redirects for HEAD requests
-                       $arrContext['http']['max_redirects'] = 1;
+               /*
+                * Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect
+                * to ::1, which fails when the server is not set up for it. For compatibility, always
+                * connect to the IPv4 address.
+                */
+               if ( 'localhost' == strtolower( $connect_host ) )
+                       $connect_host = '127.0.0.1';
 
-               if ( ! empty($r['body'] ) )
-                       $arrContext['http']['content'] = $r['body'];
+               $connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host;
 
-               $context = stream_context_create($arrContext);
+               $is_local = isset( $r['local'] ) && $r['local'];
+               $ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];
+               if ( $is_local ) {
+                       /**
+                        * Filter whether SSL should be verified for local requests.
+                        *
+                        * @since 2.8.0
+                        *
+                        * @param bool $ssl_verify Whether to verify the SSL connection. Default true.
+                        */
+                       $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );
+               } elseif ( ! $is_local ) {
+                       /**
+                        * Filter whether SSL should be verified for non-local requests.
+                        *
+                        * @since 2.8.0
+                        *
+                        * @param bool $ssl_verify Whether to verify the SSL connection. Default true.
+                        */
+                       $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );
+               }
 
-               if ( !WP_DEBUG )
-                       $handle = @fopen($url, 'r', false, $context);
-               else
-                       $handle = fopen($url, 'r', false, $context);
+               $proxy = new WP_HTTP_Proxy();
 
-               if ( ! $handle )
-                       return new WP_Error('http_request_failed', sprintf(__('Could not open handle for fopen() to %s'), $url));
+               $context = stream_context_create( array(
+                       'ssl' => array(
+                               'verify_peer' => $ssl_verify,
+                               //'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate()
+                               'capture_peer_cert' => $ssl_verify,
+                               'SNI_enabled' => true,
+                               'cafile' => $r['sslcertificates'],
+                               'allow_self_signed' => ! $ssl_verify,
+                       )
+               ) );
 
                $timeout = (int) floor( $r['timeout'] );
                $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
-               stream_set_timeout( $handle, $timeout, $utimeout );
+               $connect_timeout = max( $timeout, 1 );
 
-               if ( ! $r['blocking'] ) {
-                       stream_set_blocking($handle, 0);
-                       fclose($handle);
-                       return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
-               }
-
-               $strResponse = stream_get_contents($handle);
-               $meta = stream_get_meta_data($handle);
+               // Store error number.
+               $connection_error = null;
 
-               fclose($handle);
+               // Store error string.
+               $connection_error_str = null;
 
-               $processedHeaders = array();
-               if ( isset( $meta['wrapper_data']['headers'] ) )
-                       $processedHeaders = WP_Http::processHeaders($meta['wrapper_data']['headers']);
-               else
-                       $processedHeaders = WP_Http::processHeaders($meta['wrapper_data']);
+               if ( !WP_DEBUG ) {
+                       // In the event that the SSL connection fails, silence the many PHP Warnings.
+                       if ( $secure_transport )
+                               $error_reporting = error_reporting(0);
 
-               if ( ! empty( $strResponse ) && isset( $processedHeaders['headers']['transfer-encoding'] ) && 'chunked' == $processedHeaders['headers']['transfer-encoding'] )
-                       $strResponse = WP_Http::chunkTransferDecode($strResponse);
+                       if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
+                               $handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
+                       else
+                               $handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
 
-               if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($processedHeaders['headers']) )
-                       $strResponse = WP_Http_Encoding::decompress( $strResponse );
+                       if ( $secure_transport )
+                               error_reporting( $error_reporting );
 
-               return array('headers' => $processedHeaders['headers'], 'body' => $strResponse, 'response' => $processedHeaders['response'], 'cookies' => $processedHeaders['cookies']);
-       }
+               } else {
+                       if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
+                               $handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
+                       else
+                               $handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
+               }
 
-       /**
-        * Whether this class can be used for retrieving an URL.
-        *
-        * @static
-        * @access public
-        * @since 2.7.0
-        *
-        * @return boolean False means this class can not be used, true means it can.
-        */
-       function test($args = array()) {
-               if ( ! function_exists('fopen') || (function_exists('ini_get') && true != ini_get('allow_url_fopen')) )
-                       return false;
+               if ( false === $handle ) {
+                       // SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken.
+                       if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str )
+                               return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );
 
-               if ( version_compare(PHP_VERSION, '5.0', '<') )
-                       return false;
+                       return new WP_Error('http_request_failed', $connection_error . ': ' . $connection_error_str );
+               }
 
-               //HTTPS via Proxy was added in 5.1.0
-               $is_ssl = isset($args['ssl']) && $args['ssl'];
-               if ( $is_ssl && version_compare(PHP_VERSION, '5.1.0', '<') ) {
-                       $proxy = new WP_HTTP_Proxy();
-                       /**
-                        * No URL check, as its not currently passed to the ::test() function
-                        * In the case where a Proxy is in use, Just bypass this transport for HTTPS.
-                        */
-                       if ( $proxy->is_enabled() )
-                               return false;
+               // Verify that the SSL certificate is valid for this request.
+               if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) {
+                       if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) )
+                               return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );
                }
 
-               return apply_filters('use_streams_transport', true, $args);
-       }
-}
+               stream_set_timeout( $handle, $timeout, $utimeout );
 
-/**
- * HTTP request method uses HTTP extension to retrieve the url.
- *
- * Requires the HTTP extension to be installed. This would be the preferred transport since it can
- * handle a lot of the problems that forces the others to use the HTTP version 1.0. Even if PHP 5.2+
- * is being used, it doesn't mean that the HTTP extension will be enabled.
- *
- * @package WordPress
- * @subpackage HTTP
- * @since 2.7.0
- */
-class WP_Http_ExtHttp {
-       /**
-        * Send a HTTP request to a URI using HTTP extension.
-        *
-        * Does not support non-blocking.
-        *
-        * @access public
-        * @since 2.7
-        *
-        * @param string $url
-        * @param str|array $args Optional. Override the defaults.
-        * @return array 'headers', 'body', 'cookies' and 'response' keys.
-        */
-       function request($url, $args = array()) {
-               $defaults = array(
-                       'method' => 'GET', 'timeout' => 5,
-                       'redirection' => 5, 'httpversion' => '1.0',
-                       'blocking' => true,
-                       'headers' => array(), 'body' => null, 'cookies' => array()
-               );
+               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.
+                       $requestPath = $url;
+               else
+                       $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );
+
+               if ( empty($requestPath) )
+                       $requestPath .= '/';
+
+               $strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";
+
+               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
+                       $strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";
+               else
+                       $strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";
+
+               if ( isset($r['user-agent']) )
+                       $strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";
+
+               if ( is_array($r['headers']) ) {
+                       foreach ( (array) $r['headers'] as $header => $headerValue )
+                               $strHeaders .= $header . ': ' . $headerValue . "\r\n";
+               } else {
+                       $strHeaders .= $r['headers'];
+               }
 
-               $r = wp_parse_args( $args, $defaults );
+               if ( $proxy->use_authentication() )
+                       $strHeaders .= $proxy->authentication_header() . "\r\n";
 
-               if ( isset($r['headers']['User-Agent']) ) {
-                       $r['user-agent'] = $r['headers']['User-Agent'];
-                       unset($r['headers']['User-Agent']);
-               } else if ( isset($r['headers']['user-agent']) ) {
-                       $r['user-agent'] = $r['headers']['user-agent'];
-                       unset($r['headers']['user-agent']);
-               }
+               $strHeaders .= "\r\n";
 
-               // Construct Cookie: header if any cookies are set
-               WP_Http::buildCookieHeader( $r );
+               if ( ! is_null($r['body']) )
+                       $strHeaders .= $r['body'];
 
-               switch ( $r['method'] ) {
-                       case 'POST':
-                               $r['method'] = HTTP_METH_POST;
-                               break;
-                       case 'HEAD':
-                               $r['method'] = HTTP_METH_HEAD;
-                               break;
-                       case 'PUT':
-                               $r['method'] =  HTTP_METH_PUT;
-                               break;
-                       case 'GET':
-                       default:
-                               $r['method'] = HTTP_METH_GET;
+               fwrite($handle, $strHeaders);
+
+               if ( ! $r['blocking'] ) {
+                       stream_set_blocking( $handle, 0 );
+                       fclose( $handle );
+                       return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
                }
 
-               $arrURL = parse_url($url);
+               $strResponse = '';
+               $bodyStarted = false;
+               $keep_reading = true;
+               $block_size = 4096;
+               if ( isset( $r['limit_response_size'] ) )
+                       $block_size = min( $block_size, $r['limit_response_size'] );
+
+               // If streaming to a file setup the file handle.
+               if ( $r['stream'] ) {
+                       if ( ! WP_DEBUG )
+                               $stream_handle = @fopen( $r['filename'], 'w+' );
+                       else
+                               $stream_handle = fopen( $r['filename'], 'w+' );
+                       if ( ! $stream_handle )
+                               return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
+
+                       $bytes_written = 0;
+                       while ( ! feof($handle) && $keep_reading ) {
+                               $block = fread( $handle, $block_size );
+                               if ( ! $bodyStarted ) {
+                                       $strResponse .= $block;
+                                       if ( strpos( $strResponse, "\r\n\r\n" ) ) {
+                                               $process = WP_Http::processResponse( $strResponse );
+                                               $bodyStarted = true;
+                                               $block = $process['body'];
+                                               unset( $strResponse );
+                                               $process['body'] = '';
+                                       }
+                               }
 
-               if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
-                       $url = preg_replace('|^' . preg_quote($arrURL['scheme'], '|') . '|', 'http', $url);
+                               $this_block_size = strlen( $block );
 
-               $is_local = isset($args['local']) && $args['local'];
-               $ssl_verify = isset($args['sslverify']) && $args['sslverify'];
-               if ( $is_local )
-                       $ssl_verify = apply_filters('https_local_ssl_verify', $ssl_verify);
-               elseif ( ! $is_local )
-                       $ssl_verify = apply_filters('https_ssl_verify', $ssl_verify);
+                               if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] )
+                                       $block = substr( $block, 0, ( $r['limit_response_size'] - $bytes_written ) );
 
-               $r['timeout'] = (int) ceil( $r['timeout'] );
+                               $bytes_written_to_file = fwrite( $stream_handle, $block );
 
-               $options = array(
-                       'timeout' => $r['timeout'],
-                       'connecttimeout' => $r['timeout'],
-                       'redirect' => $r['redirection'],
-                       'useragent' => $r['user-agent'],
-                       'headers' => $r['headers'],
-                       'ssl' => array(
-                               'verifypeer' => $ssl_verify,
-                               'verifyhost' => $ssl_verify
-                       )
-               );
+                               if ( $bytes_written_to_file != $this_block_size ) {
+                                       fclose( $handle );
+                                       fclose( $stream_handle );
+                                       return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
+                               }
 
-               if ( HTTP_METH_HEAD == $r['method'] )
-                       $options['redirect'] = 0; // Assumption: Docs seem to suggest that this means do not follow. Untested.
+                               $bytes_written += $bytes_written_to_file;
 
-               // The HTTP extensions offers really easy proxy support.
-               $proxy = new WP_HTTP_Proxy();
+                               $keep_reading = !isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size'];
+                       }
 
-               if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
-                       $options['proxyhost'] = $proxy->host();
-                       $options['proxyport'] = $proxy->port();
-                       $options['proxytype'] = HTTP_PROXY_HTTP;
+                       fclose( $stream_handle );
 
-                       if ( $proxy->use_authentication() ) {
-                               $options['proxyauth'] = $proxy->authentication();
-                               $options['proxyauthtype'] = HTTP_AUTH_ANY;
+               } else {
+                       $header_length = 0;
+                       while ( ! feof( $handle ) && $keep_reading ) {
+                               $block = fread( $handle, $block_size );
+                               $strResponse .= $block;
+                               if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) {
+                                       $header_length = strpos( $strResponse, "\r\n\r\n" ) + 4;
+                                       $bodyStarted = true;
+                               }
+                               $keep_reading = ( ! $bodyStarted || !isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) );
                        }
+
+                       $process = WP_Http::processResponse( $strResponse );
+                       unset( $strResponse );
+
                }
 
-               if ( !WP_DEBUG ) //Emits warning level notices for max redirects and timeouts
-                       $strResponse = @http_request($r['method'], $url, $r['body'], $options, $info);
-               else
-                       $strResponse = http_request($r['method'], $url, $r['body'], $options, $info); //Emits warning level notices for max redirects and timeouts
+               fclose( $handle );
 
-               // Error may still be set, Response may return headers or partial document, and error
-               // contains a reason the request was aborted, eg, timeout expired or max-redirects reached.
-               if ( false === $strResponse || ! empty($info['error']) )
-                       return new WP_Error('http_request_failed', $info['response_code'] . ': ' . $info['error']);
+               $arrHeaders = WP_Http::processHeaders( $process['headers'], $url );
 
-               if ( ! $r['blocking'] )
-                       return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
+               $response = array(
+                       'headers' => $arrHeaders['headers'],
+                       // Not yet processed.
+                       'body' => null,
+                       'response' => $arrHeaders['response'],
+                       'cookies' => $arrHeaders['cookies'],
+                       'filename' => $r['filename']
+               );
 
-               $headers_body = WP_HTTP::processResponse($strResponse);
-               $theHeaders = $headers_body['headers'];
-               $theBody = $headers_body['body'];
-               unset($headers_body);
+               // Handle redirects.
+               if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )
+                       return $redirect_response;
 
-               $theHeaders = WP_Http::processHeaders($theHeaders);
+               // If the body was chunk encoded, then decode it.
+               if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )
+                       $process['body'] = WP_Http::chunkTransferDecode($process['body']);
 
-               if ( ! empty( $theBody ) && isset( $theHeaders['headers']['transfer-encoding'] ) && 'chunked' == $theHeaders['headers']['transfer-encoding'] ) {
-                       if ( !WP_DEBUG )
-                               $theBody = @http_chunked_decode($theBody);
-                       else
-                               $theBody = http_chunked_decode($theBody);
+               if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )
+                       $process['body'] = WP_Http_Encoding::decompress( $process['body'] );
+
+               if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] )
+                       $process['body'] = substr( $process['body'], 0, $r['limit_response_size'] );
+
+               $response['body'] = $process['body'];
+
+               return $response;
+       }
+
+       /**
+        * Verifies the received SSL certificate against it's Common Names and subjectAltName fields
+        *
+        * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if
+        * the certificate is valid for the hostname which was requested.
+        * This function verifies the requested hostname against certificate's subjectAltName field,
+        * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.
+        *
+        * IP Address support is included if the request is being made to an IP address.
+        *
+        * @since 3.7.0
+        * @static
+        *
+        * @param stream $stream The PHP Stream which the SSL request is being made over
+        * @param string $host The hostname being requested
+        * @return bool If the cerficiate presented in $stream is valid for $host
+        */
+       public static function verify_ssl_certificate( $stream, $host ) {
+               $context_options = stream_context_get_options( $stream );
+
+               if ( empty( $context_options['ssl']['peer_certificate'] ) )
+                       return false;
+
+               $cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );
+               if ( ! $cert )
+                       return false;
+
+               /*
+                * If the request is being made to an IP address, we'll validate against IP fields
+                * in the cert (if they exist)
+                */
+               $host_type = ( WP_HTTP::is_ip_address( $host ) ? 'ip' : 'dns' );
+
+               $certificate_hostnames = array();
+               if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {
+                       $match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );
+                       foreach ( $match_against as $match ) {
+                               list( $match_type, $match_host ) = explode( ':', $match );
+                               if ( $host_type == strtolower( trim( $match_type ) ) ) // IP: or DNS:
+                                       $certificate_hostnames[] = strtolower( trim( $match_host ) );
+                       }
+               } elseif ( !empty( $cert['subject']['CN'] ) ) {
+                       // Only use the CN when the certificate includes no subjectAltName extension.
+                       $certificate_hostnames[] = strtolower( $cert['subject']['CN'] );
                }
 
-               if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )
-                       $theBody = http_inflate( $theBody );
+               // Exact hostname/IP matches.
+               if ( in_array( strtolower( $host ), $certificate_hostnames ) )
+                       return true;
+
+               // IP's can't be wildcards, Stop processing.
+               if ( 'ip' == $host_type )
+                       return false;
 
-               $theResponse = array();
-               $theResponse['code'] = $info['response_code'];
-               $theResponse['message'] = get_status_header_desc($info['response_code']);
+               // Test to see if the domain is at least 2 deep for wildcard support.
+               if ( substr_count( $host, '.' ) < 2 )
+                       return false;
+
+               // Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com.
+               $wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );
 
-               return array('headers' => $theHeaders['headers'], 'body' => $theBody, 'response' => $theResponse, 'cookies' => $theHeaders['cookies']);
+               return in_array( strtolower( $wildcard_host ), $certificate_hostnames );
        }
 
        /**
-        * Whether this class can be used for retrieving an URL.
+        * Whether this class can be used for retrieving a URL.
         *
         * @static
+        * @access public
         * @since 2.7.0
+        * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
         *
         * @return boolean False means this class can not be used, true means it can.
         */
-       function test($args = array()) {
-               return apply_filters('use_http_extension_transport', function_exists('http_request'), $args );
+       public static function test( $args = array() ) {
+               if ( ! function_exists( 'stream_socket_client' ) )
+                       return false;
+
+               $is_ssl = isset( $args['ssl'] ) && $args['ssl'];
+
+               if ( $is_ssl ) {
+                       if ( ! extension_loaded( 'openssl' ) )
+                               return false;
+                       if ( ! function_exists( 'openssl_x509_parse' ) )
+                               return false;
+               }
+
+               /**
+                * Filter whether streams can be used as a transport for retrieving a URL.
+                *
+                * @since 2.7.0
+                *
+                * @param bool  $use_class Whether the class can be used. Default true.
+                * @param array $args      Request arguments.
+                */
+               return apply_filters( 'use_streams_transport', true, $args );
        }
 }
 
+/**
+ * Deprecated HTTP Transport method which used fsockopen.
+ *
+ * This class is not used, and is included for backwards compatibility only.
+ * All code should make use of WP_HTTP directly through it's API.
+ *
+ * @see WP_HTTP::request
+ *
+ * @since 2.7.0
+ * @deprecated 3.7.0 Please use WP_HTTP::request() directly
+ */
+class WP_HTTP_Fsockopen extends WP_HTTP_Streams {
+       // For backwards compatibility for users who are using the class directly.
+}
+
 /**
  * HTTP request method uses Curl extension to retrieve the url.
  *
@@ -1287,21 +1208,57 @@ class WP_Http_ExtHttp {
  *
  * @package WordPress
  * @subpackage HTTP
- * @since 2.7
+ * @since 2.7.0
  */
 class WP_Http_Curl {
 
+       /**
+        * Temporary header storage for during requests.
+        *
+        * @since 3.2.0
+        * @access private
+        * @var string
+        */
+       private $headers = '';
+
+       /**
+        * Temporary body storage for during requests.
+        *
+        * @since 3.6.0
+        * @access private
+        * @var string
+        */
+       private $body = '';
+
+       /**
+        * The maximum amount of data to receive from the remote server.
+        *
+        * @since 3.6.0
+        * @access private
+        * @var int
+        */
+       private $max_body_length = false;
+
+       /**
+        * The file resource used for streaming to file.
+        *
+        * @since 3.6.0
+        * @access private
+        * @var resource
+        */
+       private $stream_handle = false;
+
        /**
         * Send a HTTP request to a URI using cURL extension.
         *
         * @access public
         * @since 2.7.0
         *
-        * @param string $url
-        * @param str|array $args Optional. Override the defaults.
-        * @return array 'headers', 'body', 'cookies' and 'response' keys.
+        * @param string $url The request URL.
+        * @param string|array $args Optional. Override the defaults.
+        * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
         */
-       function request($url, $args = array()) {
+       public function request($url, $args = array()) {
                $defaults = array(
                        'method' => 'GET', 'timeout' => 5,
                        'redirection' => 5, 'httpversion' => '1.0',
@@ -1329,44 +1286,48 @@ class WP_Http_Curl {
 
                if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
 
-                       $isPHP5 = version_compare(PHP_VERSION, '5.0.0', '>=');
-
-                       if ( $isPHP5 ) {
-                               curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );
-                               curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );
-                               curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );
-                       } else {
-                               curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() .':'. $proxy->port() );
-                       }
+                       curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );
+                       curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );
+                       curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );
 
                        if ( $proxy->use_authentication() ) {
-                               if ( $isPHP5 )
-                                       curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
-
+                               curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
                                curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );
                        }
                }
 
-               $is_local = isset($args['local']) && $args['local'];
-               $ssl_verify = isset($args['sslverify']) && $args['sslverify'];
-               if ( $is_local )
-                       $ssl_verify = apply_filters('https_local_ssl_verify', $ssl_verify);
-               elseif ( ! $is_local )
-                       $ssl_verify = apply_filters('https_ssl_verify', $ssl_verify);
-
+               $is_local = isset($r['local']) && $r['local'];
+               $ssl_verify = isset($r['sslverify']) && $r['sslverify'];
+               if ( $is_local ) {
+                       /** This filter is documented in wp-includes/class-http.php */
+                       $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );
+               } elseif ( ! $is_local ) {
+                       /** This filter is documented in wp-includes/class-http.php */
+                       $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );
+               }
 
-               // CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers.  Have to use ceil since
-               // a value of 0 will allow an ulimited timeout.
+               /*
+                * CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since.
+                * a value of 0 will allow an unlimited timeout.
+                */
                $timeout = (int) ceil( $r['timeout'] );
                curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );
                curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );
 
                curl_setopt( $handle, CURLOPT_URL, $url);
                curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );
-               curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, $ssl_verify );
+               curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false );
                curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );
+               curl_setopt( $handle, CURLOPT_CAINFO, $r['sslcertificates'] );
                curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] );
-               curl_setopt( $handle, CURLOPT_MAXREDIRS, $r['redirection'] );
+
+               /*
+                * The option doesn't work with safe mode or when open_basedir is set, and there's
+                * a bug #17490 with redirected POST requests, so handle redirections outside Curl.
+                */
+               curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );
+               if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.4
+                       curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );
 
                switch ( $r['method'] ) {
                        case 'HEAD':
@@ -1380,20 +1341,39 @@ class WP_Http_Curl {
                                curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );
                                curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
                                break;
+                       default:
+                               curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $r['method'] );
+                               if ( ! is_null( $r['body'] ) )
+                                       curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
+                               break;
+               }
+
+               if ( true === $r['blocking'] ) {
+                       curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );
+                       curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );
                }
 
-               if ( true === $r['blocking'] )
-                       curl_setopt( $handle, CURLOPT_HEADER, true );
+               curl_setopt( $handle, CURLOPT_HEADER, false );
+
+               if ( isset( $r['limit_response_size'] ) )
+                       $this->max_body_length = intval( $r['limit_response_size'] );
                else
-                       curl_setopt( $handle, CURLOPT_HEADER, false );
+                       $this->max_body_length = false;
 
-               // The option doesn't work with safe mode or when open_basedir is set.
-               // Disable HEAD when making HEAD requests.
-               if ( !ini_get('safe_mode') && !ini_get('open_basedir') && 'HEAD' != $r['method'] )
-                       curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, true );
+               // If streaming to a file open a file handle, and setup our curl streaming handler.
+               if ( $r['stream'] ) {
+                       if ( ! WP_DEBUG )
+                               $this->stream_handle = @fopen( $r['filename'], 'w+' );
+                       else
+                               $this->stream_handle = fopen( $r['filename'], 'w+' );
+                       if ( ! $this->stream_handle )
+                               return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
+               } else {
+                       $this->stream_handle = false;
+               }
 
                if ( !empty( $r['headers'] ) ) {
-                       // cURL expects full header strings in each element
+                       // cURL expects full header strings in each element.
                        $headers = array();
                        foreach ( $r['headers'] as $name => $value ) {
                                $headers[] = "{$name}: $value";
@@ -1406,39 +1386,60 @@ class WP_Http_Curl {
                else
                        curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );
 
-               // Cookies are not handled by the HTTP API currently. Allow for plugin authors to handle it
-               // themselves... Although, it is somewhat pointless without some reference.
-               do_action_ref_array( 'http_api_curl', array(&$handle) );
+               /**
+                * Fires before the cURL request is executed.
+                *
+                * Cookies are not currently handled by the HTTP API. This action allows
+                * plugins to handle cookies themselves.
+                *
+                * @since 2.8.0
+                *
+                * @param resource &$handle The cURL handle returned by curl_init().
+                * @param array    $r       The HTTP request arguments.
+                * @param string   $url     The request URL.
+                */
+               do_action_ref_array( 'http_api_curl', array( &$handle, $r, $url ) );
 
                // We don't need to return the body, so don't. Just execute request and return.
                if ( ! $r['blocking'] ) {
                        curl_exec( $handle );
+
+                       if ( $curl_error = curl_error( $handle ) ) {
+                               curl_close( $handle );
+                               return new WP_Error( 'http_request_failed', $curl_error );
+                       }
+                       if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {
+                               curl_close( $handle );
+                               return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
+                       }
+
                        curl_close( $handle );
                        return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
                }
 
-               $theResponse = curl_exec( $handle );
+               curl_exec( $handle );
+               $theHeaders = WP_Http::processHeaders( $this->headers, $url );
+               $theBody = $this->body;
 
-               if ( !empty($theResponse) ) {
-                       $headerLength = curl_getinfo($handle, CURLINFO_HEADER_SIZE);
-                       $theHeaders = trim( substr($theResponse, 0, $headerLength) );
-                       if ( strlen($theResponse) > $headerLength )
-                               $theBody = substr( $theResponse, $headerLength );
-                       else
-                               $theBody = '';
-                       if ( false !== strpos($theHeaders, "\r\n\r\n") ) {
-                               $headerParts = explode("\r\n\r\n", $theHeaders);
-                               $theHeaders = $headerParts[ count($headerParts) -1 ];
-                       }
-                       $theHeaders = WP_Http::processHeaders($theHeaders);
-               } else {
-                       if ( $curl_error = curl_error($handle) )
-                               return new WP_Error('http_request_failed', $curl_error);
-                       if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array(301, 302) ) )
-                               return new WP_Error('http_request_failed', __('Too many redirects.'));
+               $this->headers = '';
+               $this->body = '';
 
-                       $theHeaders = array( 'headers' => array(), 'cookies' => array() );
-                       $theBody = '';
+               $curl_error = curl_errno( $handle );
+
+               // If an error occurred, or, no response.
+               if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) {
+                       if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error &&  $r['stream'] ) {
+                               fclose( $this->stream_handle );
+                               return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
+                       }
+                       if ( $curl_error = curl_error( $handle ) ) {
+                               curl_close( $handle );
+                               return new WP_Error( 'http_request_failed', $curl_error );
+                       }
+                       if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {
+                               curl_close( $handle );
+                               return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
+                       }
                }
 
                $response = array();
@@ -1447,19 +1448,68 @@ class WP_Http_Curl {
 
                curl_close( $handle );
 
-               // See #11305 - When running under safe mode, redirection is disabled above. Handle it manually.
-               if ( !empty($theHeaders['headers']['location']) && (ini_get('safe_mode') || ini_get('open_basedir')) ) {
-                       if ( $r['redirection']-- > 0 ) {
-                               return $this->request($theHeaders['headers']['location'], $r);
-                       } else {
-                               return new WP_Error('http_request_failed', __('Too many redirects.'));
-                       }
-               }
+               if ( $r['stream'] )
+                       fclose( $this->stream_handle );
+
+               $response = array(
+                       'headers' => $theHeaders['headers'],
+                       'body' => null,
+                       'response' => $response,
+                       'cookies' => $theHeaders['cookies'],
+                       'filename' => $r['filename']
+               );
+
+               // Handle redirects.
+               if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )
+                       return $redirect_response;
 
                if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )
                        $theBody = WP_Http_Encoding::decompress( $theBody );
 
-               return array('headers' => $theHeaders['headers'], 'body' => $theBody, 'response' => $response, 'cookies' => $theHeaders['cookies']);
+               $response['body'] = $theBody;
+
+               return $response;
+       }
+
+       /**
+        * Grab the headers of the cURL request
+        *
+        * Each header is sent individually to this callback, so we append to the $header property for temporary storage
+        *
+        * @since 3.2.0
+        * @access private
+        * @return int
+        */
+       private function stream_headers( $handle, $headers ) {
+               $this->headers .= $headers;
+               return strlen( $headers );
+       }
+
+       /**
+        * Grab the body of the cURL request
+        *
+        * The contents of the document are passed in chunks, so we append to the $body property for temporary storage.
+        * Returning a length shorter than the length of $data passed in will cause cURL to abort the request as "completed"
+        *
+        * @since 3.6.0
+        * @access private
+        * @return int
+        */
+       private function stream_body( $handle, $data ) {
+               $data_length = strlen( $data );
+
+               if ( $this->max_body_length && ( strlen( $this->body ) + $data_length ) > $this->max_body_length )
+                       $data = substr( $data, 0, ( $this->max_body_length - $data_length ) );
+
+               if ( $this->stream_handle ) {
+                       $bytes_written = fwrite( $this->stream_handle, $data );
+               } else {
+                       $this->body .= $data;
+                       $bytes_written = $data_length;
+               }
+
+               // Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.
+               return $bytes_written;
        }
 
        /**
@@ -1470,11 +1520,28 @@ class WP_Http_Curl {
         *
         * @return boolean False means this class can not be used, true means it can.
         */
-       function test($args = array()) {
-               if ( function_exists('curl_init') && function_exists('curl_exec') )
-                       return apply_filters('use_curl_transport', true, $args);
+       public static function test( $args = array() ) {
+               if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) )
+                       return false;
 
-               return false;
+               $is_ssl = isset( $args['ssl'] ) && $args['ssl'];
+
+               if ( $is_ssl ) {
+                       $curl_version = curl_version();
+                       // Check whether this cURL version support SSL requests.
+                       if ( ! (CURL_VERSION_SSL & $curl_version['features']) )
+                               return false;
+               }
+
+               /**
+                * Filter whether cURL can be used as a transport for retrieving a URL.
+                *
+                * @since 2.7.0
+                *
+                * @param bool  $use_class Whether the class can be used. Default true.
+                * @param array $args      An array of request arguments.
+                */
+               return apply_filters( 'use_curl_transport', true, $args );
        }
 }
 
@@ -1486,7 +1553,7 @@ class WP_Http_Curl {
  * constants.
  *
  * Please note that only BASIC authentication is supported by most transports.
- * cURL and the PHP HTTP Extension MAY support more methods (such as NTLM authentication) depending on your environment.
+ * cURL MAY support more methods (such as NTLM authentication) depending on your environment.
  *
  * The constants are as follows:
  * <ol>
@@ -1508,44 +1575,46 @@ class WP_Http_Curl {
  *
  * @link http://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.
  * @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS
- * @since 2.8
+ * @since 2.8.0
  */
 class WP_HTTP_Proxy {
 
        /**
         * Whether proxy connection should be used.
         *
-        * @since 2.8
+        * @since 2.8.0
+        *
         * @use WP_PROXY_HOST
         * @use WP_PROXY_PORT
         *
         * @return bool
         */
-       function is_enabled() {
+       public function is_enabled() {
                return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT');
        }
 
        /**
         * Whether authentication should be used.
         *
-        * @since 2.8
+        * @since 2.8.0
+        *
         * @use WP_PROXY_USERNAME
         * @use WP_PROXY_PASSWORD
         *
         * @return bool
         */
-       function use_authentication() {
+       public function use_authentication() {
                return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD');
        }
 
        /**
         * Retrieve the host for the proxy server.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function host() {
+       public function host() {
                if ( defined('WP_PROXY_HOST') )
                        return WP_PROXY_HOST;
 
@@ -1555,11 +1624,11 @@ class WP_HTTP_Proxy {
        /**
         * Retrieve the port for the proxy server.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function port() {
+       public function port() {
                if ( defined('WP_PROXY_PORT') )
                        return WP_PROXY_PORT;
 
@@ -1569,11 +1638,11 @@ class WP_HTTP_Proxy {
        /**
         * Retrieve the username for proxy authentication.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function username() {
+       public function username() {
                if ( defined('WP_PROXY_USERNAME') )
                        return WP_PROXY_USERNAME;
 
@@ -1583,11 +1652,11 @@ class WP_HTTP_Proxy {
        /**
         * Retrieve the password for proxy authentication.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function password() {
+       public function password() {
                if ( defined('WP_PROXY_PASSWORD') )
                        return WP_PROXY_PASSWORD;
 
@@ -1597,22 +1666,22 @@ class WP_HTTP_Proxy {
        /**
         * Retrieve authentication string for proxy authentication.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function authentication() {
+       public function authentication() {
                return $this->username() . ':' . $this->password();
        }
 
        /**
         * Retrieve header string for proxy authentication.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string
         */
-       function authentication_header() {
+       public function authentication_header() {
                return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );
        }
 
@@ -1629,9 +1698,11 @@ class WP_HTTP_Proxy {
         * @param string $uri URI to check.
         * @return bool True, to send through the proxy and false if, the proxy should not be used.
         */
-       function send_through_proxy( $uri ) {
-               // parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
-               // This will be displayed on blogs, which is not reasonable.
+       public function send_through_proxy( $uri ) {
+               /*
+                * parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
+                * This will be displayed on blogs, which is not reasonable.
+                */
                $check = @parse_url($uri);
 
                // Malformed URL, can not process, but this could mean ssl, so let through anyway.
@@ -1640,7 +1711,24 @@ class WP_HTTP_Proxy {
 
                $home = parse_url( get_option('siteurl') );
 
-               if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )
+               /**
+                * Filter whether to preempt sending the request through the proxy server.
+                *
+                * Returning false will bypass the proxy; returning true will send
+                * the request through the proxy. Returning null bypasses the filter.
+                *
+                * @since 3.5.0
+                *
+                * @param null   $override Whether to override the request result. Default null.
+                * @param string $uri      URL to check.
+                * @param array  $check    Associative array result of parsing the URI.
+                * @param array  $home     Associative array result of parsing the site URL.
+                */
+               $result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home );
+               if ( ! is_null( $result ) )
+                       return $result;
+
+               if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) )
                        return false;
 
                if ( !defined('WP_PROXY_BYPASS_HOSTS') )
@@ -1654,7 +1742,7 @@ class WP_HTTP_Proxy {
                        if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) {
                                $wildcard_regex = array();
                                foreach ( $bypass_hosts as $host )
-                                       $wildcard_regex[] = str_replace('\*', '[\w.]+?', preg_quote($host, '/'));
+                                       $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
                                $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';
                        }
                }
@@ -1686,7 +1774,7 @@ class WP_Http_Cookie {
         * @since 2.8.0
         * @var string
         */
-       var $name;
+       public $name;
 
        /**
         * Cookie value.
@@ -1694,7 +1782,7 @@ class WP_Http_Cookie {
         * @since 2.8.0
         * @var string
         */
-       var $value;
+       public $value;
 
        /**
         * When the cookie expires.
@@ -1702,7 +1790,7 @@ class WP_Http_Cookie {
         * @since 2.8.0
         * @var string
         */
-       var $expires;
+       public $expires;
 
        /**
         * Cookie URL path.
@@ -1710,7 +1798,7 @@ class WP_Http_Cookie {
         * @since 2.8.0
         * @var string
         */
-       var $path;
+       public $path;
 
        /**
         * Cookie Domain.
@@ -1718,18 +1806,7 @@ class WP_Http_Cookie {
         * @since 2.8.0
         * @var string
         */
-       var $domain;
-
-       /**
-        * PHP4 style Constructor - Calls PHP5 Style Constructor.
-        *
-        * @access public
-        * @since 2.8.0
-        * @param string|array $data Raw cookie data.
-        */
-       function WP_Http_Cookie( $data ) {
-               $this->__construct( $data );
-       }
+       public $domain;
 
        /**
         * Sets up this cookie object.
@@ -1737,36 +1814,50 @@ class WP_Http_Cookie {
         * The parameter $data should be either an associative array containing the indices names below
         * or a header string detailing it.
         *
-        * If it's an array, it should include the following elements:
-        * <ol>
-        * <li>Name</li>
-        * <li>Value - should NOT be urlencoded already.</li>
-        * <li>Expires - (optional) String or int (UNIX timestamp).</li>
-        * <li>Path (optional)</li>
-        * <li>Domain (optional)</li>
-        * </ol>
-        *
-        * @access public
         * @since 2.8.0
+        * @access public
         *
-        * @param string|array $data Raw cookie data.
+        * @param string|array $data {
+        *     Raw cookie data as header string or data array.
+        *
+        *     @type string     $name    Cookie name.
+        *     @type mixed      $value   Value. Should NOT already be urlencoded.
+        *     @type string|int $expires Optional. Unix timestamp or formatted date. Default null.
+        *     @type string     $path    Optional. Path. Default '/'.
+        *     @type string     $domain  Optional. Domain. Default host of parsed $requested_url.
+        *     @type int        $port    Optional. Port. Default null.
+        * }
+        * @param string       $requested_url The URL which the cookie was set on, used for default $domain
+        *                                    and $port values.
         */
-       function __construct( $data ) {
+       public function __construct( $data, $requested_url = '' ) {
+               if ( $requested_url )
+                       $arrURL = @parse_url( $requested_url );
+               if ( isset( $arrURL['host'] ) )
+                       $this->domain = $arrURL['host'];
+               $this->path = isset( $arrURL['path'] ) ? $arrURL['path'] : '/';
+               if (  '/' != substr( $this->path, -1 ) )
+                       $this->path = dirname( $this->path ) . '/';
+
                if ( is_string( $data ) ) {
-                       // Assume it's a header string direct from a previous request
+                       // Assume it's a header string direct from a previous request.
                        $pairs = explode( ';', $data );
 
-                       // Special handling for first pair; name=value. Also be careful of "=" in value
+                       // Special handling for first pair; name=value. Also be careful of "=" in value.
                        $name  = trim( substr( $pairs[0], 0, strpos( $pairs[0], '=' ) ) );
                        $value = substr( $pairs[0], strpos( $pairs[0], '=' ) + 1 );
                        $this->name  = $name;
                        $this->value = urldecode( $value );
-                       array_shift( $pairs ); //Removes name=value from items.
 
-                       // Set everything else as a property
+                       // Removes name=value from items.
+                       array_shift( $pairs );
+
+                       // Set everything else as a property.
                        foreach ( $pairs as $pair ) {
                                $pair = rtrim($pair);
-                               if ( empty($pair) ) //Handles the cookie ending in ; which results in a empty final pair
+
+                               // Handle the cookie ending in ; which results in a empty final pair.
+                               if ( empty($pair) )
                                        continue;
 
                                list( $key, $val ) = strpos( $pair, '=' ) ? explode( '=', $pair ) : array( $pair, '' );
@@ -1779,11 +1870,11 @@ class WP_Http_Cookie {
                        if ( !isset( $data['name'] ) )
                                return false;
 
-                       // Set properties based directly on parameters
-                       $this->name   = $data['name'];
-                       $this->value  = isset( $data['value'] ) ? $data['value'] : '';
-                       $this->path   = isset( $data['path'] ) ? $data['path'] : '';
-                       $this->domain = isset( $data['domain'] ) ? $data['domain'] : '';
+                       // Set properties based directly on parameters.
+                       foreach ( array( 'name', 'value', 'path', 'domain', 'port' ) as $field ) {
+                               if ( isset( $data[ $field ] ) )
+                                       $this->$field = $data[ $field ];
+                       }
 
                        if ( isset( $data['expires'] ) )
                                $this->expires = is_int( $data['expires'] ) ? $data['expires'] : strtotime( $data['expires'] );
@@ -1801,35 +1892,38 @@ class WP_Http_Cookie {
         * @since 2.8.0
         *
         * @param string $url URL you intend to send this cookie to
-        * @return boolean TRUE if allowed, FALSE otherwise.
+        * @return boolean true if allowed, false otherwise.
         */
-       function test( $url ) {
-               // Expires - if expired then nothing else matters
-               if ( time() > $this->expires )
+       public function test( $url ) {
+               if ( is_null( $this->name ) )
+                       return false;
+
+               // Expires - if expired then nothing else matters.
+               if ( isset( $this->expires ) && time() > $this->expires )
                        return false;
 
-               // Get details on the URL we're thinking about sending to
+               // Get details on the URL we're thinking about sending to.
                $url = parse_url( $url );
-               $url['port'] = isset( $url['port'] ) ? $url['port'] : 80;
+               $url['port'] = isset( $url['port'] ) ? $url['port'] : ( 'https' == $url['scheme'] ? 443 : 80 );
                $url['path'] = isset( $url['path'] ) ? $url['path'] : '/';
 
-               // Values to use for comparison against the URL
+               // Values to use for comparison against the URL.
                $path   = isset( $this->path )   ? $this->path   : '/';
-               $port   = isset( $this->port )   ? $this->port   : 80;
+               $port   = isset( $this->port )   ? $this->port   : null;
                $domain = isset( $this->domain ) ? strtolower( $this->domain ) : strtolower( $url['host'] );
                if ( false === stripos( $domain, '.' ) )
                        $domain .= '.local';
 
-               // Host - very basic check that the request URL ends with the domain restriction (minus leading dot)
+               // Host - very basic check that the request URL ends with the domain restriction (minus leading dot).
                $domain = substr( $domain, 0, 1 ) == '.' ? substr( $domain, 1 ) : $domain;
                if ( substr( $url['host'], -strlen( $domain ) ) != $domain )
                        return false;
 
-               // Port - supports "port-lists" in the format: "80,8000,8080"
-               if ( !in_array( $url['port'], explode( ',', $port) ) )
+               // Port - supports "port-lists" in the format: "80,8000,8080".
+               if ( !empty( $port ) && !in_array( $url['port'], explode( ',', $port) ) )
                        return false;
 
-               // Path - request path must start with path restriction
+               // Path - request path must start with path restriction.
                if ( substr( $url['path'], 0, strlen( $path ) ) != $path )
                        return false;
 
@@ -1844,11 +1938,19 @@ class WP_Http_Cookie {
         *
         * @return string Header encoded cookie name and value.
         */
-       function getHeaderValue() {
-               if ( empty( $this->name ) || empty( $this->value ) )
+       public function getHeaderValue() {
+               if ( ! isset( $this->name ) || ! isset( $this->value ) )
                        return '';
 
-               return $this->name . '=' . urlencode( $this->value );
+               /**
+                * Filter the header-encoded cookie value.
+                *
+                * @since 3.4.0
+                *
+                * @param string $value The cookie value.
+                * @param string $name  The cookie name.
+                */
+               return $this->name . '=' . apply_filters( 'wp_http_cookie_value', $this->value, $this->name );
        }
 
        /**
@@ -1859,7 +1961,7 @@ class WP_Http_Cookie {
         *
         * @return string
         */
-       function getFullHeader() {
+       public function getFullHeader() {
                return 'Cookie: ' . $this->getHeaderValue();
        }
 }
@@ -1869,7 +1971,7 @@ class WP_Http_Cookie {
  *
  * Includes RFC 1950, RFC 1951, and RFC 1952.
  *
- * @since 2.8
+ * @since 2.8.0
  * @package WordPress
  * @subpackage HTTP
  */
@@ -1880,14 +1982,14 @@ class WP_Http_Encoding {
         *
         * Supports the RFC 1951 standard.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @param string $raw String to compress.
         * @param int $level Optional, default is 9. Compression level, 9 is highest.
         * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
         * @return string|bool False on failure.
         */
-       function compress( $raw, $level = 9, $supports = null ) {
+       public static function compress( $raw, $level = 9, $supports = null ) {
                return gzdeflate( $raw, $level );
        }
 
@@ -1899,13 +2001,13 @@ class WP_Http_Encoding {
         * 1952 standard gzip decode will be attempted. If all fail, then the
         * original compressed string will be returned.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @param string $compressed String to decompress.
         * @param int $length The optional length of the compressed data.
         * @return string|bool False on failure.
         */
-       function decompress( $compressed, $length = null ) {
+       public static function decompress( $compressed, $length = null ) {
 
                if ( empty($compressed) )
                        return $compressed;
@@ -1932,18 +2034,26 @@ class WP_Http_Encoding {
        /**
         * Decompression of deflated string while staying compatible with the majority of servers.
         *
-        * Certain Servers will return deflated data with headers which PHP's gziniflate()
-        * function cannot handle out of the box. The following function lifted from
-        * http://au2.php.net/manual/en/function.gzinflate.php#77336 will attempt to deflate
-        * the various return forms used.
+        * Certain Servers will return deflated data with headers which PHP's gzinflate()
+        * function cannot handle out of the box. The following function has been created from
+        * various snippets on the gzinflate() PHP documentation.
+        *
+        * Warning: Magic numbers within. Due to the potential different formats that the compressed
+        * data may be returned in, some "magic offsets" are needed to ensure proper decompression
+        * takes place. For a simple progmatic way to determine the magic offset in use, see:
+        * http://core.trac.wordpress.org/ticket/18273
         *
         * @since 2.8.1
+        * @link http://core.trac.wordpress.org/ticket/18273
+        * @link http://au2.php.net/manual/en/function.gzinflate.php#70875
         * @link http://au2.php.net/manual/en/function.gzinflate.php#77336
         *
         * @param string $gzData String to decompress.
         * @return string|bool False on failure.
         */
-       function compatible_gzinflate($gzData) {
+       public static function compatible_gzinflate($gzData) {
+
+               // Compressed data might contain a full header, if so strip it for gzinflate().
                if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {
                        $i = 10;
                        $flg = ord( substr($gzData, 3, 1) );
@@ -1959,53 +2069,83 @@ class WP_Http_Encoding {
                                if ( $flg & 2 )
                                        $i = $i + 2;
                        }
-                       return gzinflate( substr($gzData, $i, -8) );
-               } else {
-                       return false;
+                       $decompressed = @gzinflate( substr($gzData, $i, -8) );
+                       if ( false !== $decompressed )
+                               return $decompressed;
                }
+
+               // Compressed data from java.util.zip.Deflater amongst others.
+               $decompressed = @gzinflate( substr($gzData, 2) );
+               if ( false !== $decompressed )
+                       return $decompressed;
+
+               return false;
        }
 
        /**
         * What encoding types to accept and their priority values.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string Types of encoding to accept.
         */
-       function accept_encoding() {
+       public static function accept_encoding( $url, $args ) {
                $type = array();
-               if ( function_exists( 'gzinflate' ) )
-                       $type[] = 'deflate;q=1.0';
+               $compression_enabled = WP_Http_Encoding::is_available();
+
+               if ( ! $args['decompress'] ) // Decompression specifically disabled.
+                       $compression_enabled = false;
+               elseif ( $args['stream'] ) // Disable when streaming to file.
+                       $compression_enabled = false;
+               elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it.
+                       $compression_enabled = false;
+
+               if ( $compression_enabled ) {
+                       if ( function_exists( 'gzinflate' ) )
+                               $type[] = 'deflate;q=1.0';
 
-               if ( function_exists( 'gzuncompress' ) )
-                       $type[] = 'compress;q=0.5';
+                       if ( function_exists( 'gzuncompress' ) )
+                               $type[] = 'compress;q=0.5';
 
-               if ( function_exists( 'gzdecode' ) )
-                       $type[] = 'gzip;q=0.5';
+                       if ( function_exists( 'gzdecode' ) )
+                               $type[] = 'gzip;q=0.5';
+               }
+
+               /**
+                * Filter the allowed encoding types.
+                *
+                * @since 3.6.0
+                *
+                * @param array  $type Encoding types allowed. Accepts 'gzinflate',
+                *                     'gzuncompress', 'gzdecode'.
+                * @param string $url  URL of the HTTP request.
+                * @param array  $args HTTP request arguments.
+                */
+               $type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );
 
                return implode(', ', $type);
        }
 
        /**
-        * What enconding the content used when it was compressed to send in the headers.
+        * What encoding the content used when it was compressed to send in the headers.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return string Content-Encoding string to send in the header.
         */
-       function content_encoding() {
+       public static function content_encoding() {
                return 'deflate';
        }
 
        /**
         * Whether the content be decoded based on the headers.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @param array|string $headers All of the available headers.
         * @return bool
         */
-       function should_decode($headers) {
+       public static function should_decode($headers) {
                if ( is_array( $headers ) ) {
                        if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
                                return true;
@@ -2023,11 +2163,11 @@ class WP_Http_Encoding {
         * ensure that the functions all exist in the PHP version and aren't
         * disabled.
         *
-        * @since 2.8
+        * @since 2.8.0
         *
         * @return bool
         */
-       function is_available() {
+       public static function is_available() {
                return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') );
        }
 }