+ * @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.