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class-http.php (39710B)

---

 <?php
 /**
  * HTTP API: WP_Http class
  *
  * @package WordPress
  * @subpackage HTTP
  * @since 2.7.0
  */
 
 if ( ! class_exists( 'Requests' ) ) {
 	require ABSPATH . WPINC . '/class-requests.php';
 
 	Requests::register_autoloader();
 	Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' );
 }
 
 /**
  * Core class used for managing HTTP transports and making HTTP requests.
  *
  * 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.
  *
  * @since 2.7.0
  */
 class WP_Http {
 
 	// Aliases for HTTP response codes.
 	const HTTP_CONTINUE       = 100;
 	const SWITCHING_PROTOCOLS = 101;
 	const PROCESSING          = 102;
 	const EARLY_HINTS         = 103;
 
 	const OK                            = 200;
 	const CREATED                       = 201;
 	const ACCEPTED                      = 202;
 	const NON_AUTHORITATIVE_INFORMATION = 203;
 	const NO_CONTENT                    = 204;
 	const RESET_CONTENT                 = 205;
 	const PARTIAL_CONTENT               = 206;
 	const MULTI_STATUS                  = 207;
 	const IM_USED                       = 226;
 
 	const MULTIPLE_CHOICES   = 300;
 	const MOVED_PERMANENTLY  = 301;
 	const FOUND              = 302;
 	const SEE_OTHER          = 303;
 	const NOT_MODIFIED       = 304;
 	const USE_PROXY          = 305;
 	const RESERVED           = 306;
 	const TEMPORARY_REDIRECT = 307;
 	const PERMANENT_REDIRECT = 308;
 
 	const BAD_REQUEST                     = 400;
 	const UNAUTHORIZED                    = 401;
 	const PAYMENT_REQUIRED                = 402;
 	const FORBIDDEN                       = 403;
 	const NOT_FOUND                       = 404;
 	const METHOD_NOT_ALLOWED              = 405;
 	const NOT_ACCEPTABLE                  = 406;
 	const PROXY_AUTHENTICATION_REQUIRED   = 407;
 	const REQUEST_TIMEOUT                 = 408;
 	const CONFLICT                        = 409;
 	const GONE                            = 410;
 	const LENGTH_REQUIRED                 = 411;
 	const PRECONDITION_FAILED             = 412;
 	const REQUEST_ENTITY_TOO_LARGE        = 413;
 	const REQUEST_URI_TOO_LONG            = 414;
 	const UNSUPPORTED_MEDIA_TYPE          = 415;
 	const REQUESTED_RANGE_NOT_SATISFIABLE = 416;
 	const EXPECTATION_FAILED              = 417;
 	const IM_A_TEAPOT                     = 418;
 	const MISDIRECTED_REQUEST             = 421;
 	const UNPROCESSABLE_ENTITY            = 422;
 	const LOCKED                          = 423;
 	const FAILED_DEPENDENCY               = 424;
 	const UPGRADE_REQUIRED                = 426;
 	const PRECONDITION_REQUIRED           = 428;
 	const TOO_MANY_REQUESTS               = 429;
 	const REQUEST_HEADER_FIELDS_TOO_LARGE = 431;
 	const UNAVAILABLE_FOR_LEGAL_REASONS   = 451;
 
 	const INTERNAL_SERVER_ERROR           = 500;
 	const NOT_IMPLEMENTED                 = 501;
 	const BAD_GATEWAY                     = 502;
 	const SERVICE_UNAVAILABLE             = 503;
 	const GATEWAY_TIMEOUT                 = 504;
 	const HTTP_VERSION_NOT_SUPPORTED      = 505;
 	const VARIANT_ALSO_NEGOTIATES         = 506;
 	const INSUFFICIENT_STORAGE            = 507;
 	const NOT_EXTENDED                    = 510;
 	const NETWORK_AUTHENTICATION_REQUIRED = 511;
 
 	/**
 	 * Send an HTTP request to a URI.
 	 *
 	 * Please note: The only URI that are supported in the HTTP Transport implementation
 	 * are the HTTP and HTTPS protocols.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @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', 'PUT', 'DELETE',
 	 *                                             'TRACE', 'OPTIONS', or 'PATCH'.
 	 *                                             Some transports technically allow others, but should not be
 	 *                                             assumed. Default 'GET'.
 	 *     @type float        $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/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ).
 	 *     @type bool         $reject_unsafe_urls  Whether to pass URLs through 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.
 	 */
 	public function request( $url, $args = array() ) {
 		$defaults = array(
 			'method'              => 'GET',
 			/**
 			 * Filters the timeout value for an HTTP request.
 			 *
 			 * @since 2.7.0
 			 * @since 5.1.0 The `$url` parameter was added.
 			 *
 			 * @param float  $timeout_value Time in seconds until a request times out. Default 5.
 			 * @param string $url           The request URL.
 			 */
 			'timeout'             => apply_filters( 'http_request_timeout', 5, $url ),
 			/**
 			 * Filters the number of redirects allowed during an HTTP request.
 			 *
 			 * @since 2.7.0
 			 * @since 5.1.0 The `$url` parameter was added.
 			 *
 			 * @param int    $redirect_count Number of redirects allowed. Default 5.
 			 * @param string $url            The request URL.
 			 */
 			'redirection'         => apply_filters( 'http_request_redirection_count', 5, $url ),
 			/**
 			 * Filters the version of the HTTP protocol used in a request.
 			 *
 			 * @since 2.7.0
 			 * @since 5.1.0 The `$url` parameter was added.
 			 *
 			 * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'.
 			 * @param string $url     The request URL.
 			 */
 			'httpversion'         => apply_filters( 'http_request_version', '1.0', $url ),
 			/**
 			 * Filters the user agent value sent with an HTTP request.
 			 *
 			 * @since 2.7.0
 			 * @since 5.1.0 The `$url` parameter was added.
 			 *
 			 * @param string $user_agent WordPress user agent string.
 			 * @param string $url        The request URL.
 			 */
 			'user-agent'          => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ),
 			/**
 			 * Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.
 			 *
 			 * @since 3.6.0
 			 * @since 5.1.0 The `$url` parameter was added.
 			 *
 			 * @param bool   $pass_url Whether to pass URLs through wp_http_validate_url(). Default false.
 			 * @param string $url      The request URL.
 			 */
 			'reject_unsafe_urls'  => apply_filters( 'http_request_reject_unsafe_urls', false, $url ),
 			'blocking'            => true,
 			'headers'             => array(),
 			'cookies'             => array(),
 			'body'                => null,
 			'compress'            => false,
 			'decompress'          => 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;
 		}
 
 		$parsed_args = wp_parse_args( $args, $defaults );
 		/**
 		 * Filters the arguments used in an HTTP request.
 		 *
 		 * @since 2.7.0
 		 *
 		 * @param array  $parsed_args An array of HTTP request arguments.
 		 * @param string $url         The request URL.
 		 */
 		$parsed_args = apply_filters( 'http_request_args', $parsed_args, $url );
 
 		// The transports decrement this, store a copy of the original value for loop purposes.
 		if ( ! isset( $parsed_args['_redirection'] ) ) {
 			$parsed_args['_redirection'] = $parsed_args['redirection'];
 		}
 
 		/**
 		 * Filters the preemptive return value of an HTTP request.
 		 *
 		 * Returning a non-false value from the filter will short-circuit the HTTP request and return
 		 * early with that value. A filter should return one of:
 		 *
 		 *  - An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements
 		 *  - A WP_Error instance
 		 *  - boolean false to avoid short-circuiting the response
 		 *
 		 * Returning any other value may result in unexpected behaviour.
 		 *
 		 * @since 2.9.0
 		 *
 		 * @param false|array|WP_Error $preempt     A preemptive return value of an HTTP request. Default false.
 		 * @param array                $parsed_args HTTP request arguments.
 		 * @param string               $url         The request URL.
 		 */
 		$pre = apply_filters( 'pre_http_request', false, $parsed_args, $url );
 
 		if ( false !== $pre ) {
 			return $pre;
 		}
 
 		if ( function_exists( 'wp_kses_bad_protocol' ) ) {
 			if ( $parsed_args['reject_unsafe_urls'] ) {
 				$url = wp_http_validate_url( $url );
 			}
 			if ( $url ) {
 				$url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
 			}
 		}
 
 		$arrURL = parse_url( $url );
 
 		if ( empty( $url ) || empty( $arrURL['scheme'] ) ) {
 			$response = new WP_Error( 'http_request_failed', __( 'A valid URL was not provided.' ) );
 			/** This action is documented in wp-includes/class-http.php */
 			do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 			return $response;
 		}
 
 		if ( $this->block_request( $url ) ) {
 			$response = new WP_Error( 'http_request_not_executed', __( 'User has blocked requests through HTTP.' ) );
 			/** This action is documented in wp-includes/class-http.php */
 			do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 			return $response;
 		}
 
 		// 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 ( $parsed_args['stream'] ) {
 			if ( empty( $parsed_args['filename'] ) ) {
 				$parsed_args['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.
 			$parsed_args['blocking'] = true;
 			if ( ! wp_is_writable( dirname( $parsed_args['filename'] ) ) ) {
 				$response = new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );
 				/** This action is documented in wp-includes/class-http.php */
 				do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 				return $response;
 			}
 		}
 
 		if ( is_null( $parsed_args['headers'] ) ) {
 			$parsed_args['headers'] = array();
 		}
 
 		// WP allows passing in headers as a string, weirdly.
 		if ( ! is_array( $parsed_args['headers'] ) ) {
 			$processedHeaders       = WP_Http::processHeaders( $parsed_args['headers'] );
 			$parsed_args['headers'] = $processedHeaders['headers'];
 		}
 
 		// Setup arguments.
 		$headers = $parsed_args['headers'];
 		$data    = $parsed_args['body'];
 		$type    = $parsed_args['method'];
 		$options = array(
 			'timeout'   => $parsed_args['timeout'],
 			'useragent' => $parsed_args['user-agent'],
 			'blocking'  => $parsed_args['blocking'],
 			'hooks'     => new WP_HTTP_Requests_Hooks( $url, $parsed_args ),
 		);
 
 		// Ensure redirects follow browser behaviour.
 		$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) );
 
 		// Validate redirected URLs.
 		if ( function_exists( 'wp_kses_bad_protocol' ) && $parsed_args['reject_unsafe_urls'] ) {
 			$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'validate_redirects' ) );
 		}
 
 		if ( $parsed_args['stream'] ) {
 			$options['filename'] = $parsed_args['filename'];
 		}
 		if ( empty( $parsed_args['redirection'] ) ) {
 			$options['follow_redirects'] = false;
 		} else {
 			$options['redirects'] = $parsed_args['redirection'];
 		}
 
 		// Use byte limit, if we can.
 		if ( isset( $parsed_args['limit_response_size'] ) ) {
 			$options['max_bytes'] = $parsed_args['limit_response_size'];
 		}
 
 		// If we've got cookies, use and convert them to Requests_Cookie.
 		if ( ! empty( $parsed_args['cookies'] ) ) {
 			$options['cookies'] = WP_Http::normalize_cookies( $parsed_args['cookies'] );
 		}
 
 		// SSL certificate handling.
 		if ( ! $parsed_args['sslverify'] ) {
 			$options['verify']     = false;
 			$options['verifyname'] = false;
 		} else {
 			$options['verify'] = $parsed_args['sslcertificates'];
 		}
 
 		// All non-GET/HEAD requests should put the arguments in the form body.
 		if ( 'HEAD' !== $type && 'GET' !== $type ) {
 			$options['data_format'] = 'body';
 		}
 
 		/**
 		 * Filters whether SSL should be verified for non-local requests.
 		 *
 		 * @since 2.8.0
 		 * @since 5.1.0 The `$url` parameter was added.
 		 *
 		 * @param bool   $ssl_verify Whether to verify the SSL connection. Default true.
 		 * @param string $url        The request URL.
 		 */
 		$options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'], $url );
 
 		// Check for proxies.
 		$proxy = new WP_HTTP_Proxy();
 		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
 			$options['proxy'] = new Requests_Proxy_HTTP( $proxy->host() . ':' . $proxy->port() );
 
 			if ( $proxy->use_authentication() ) {
 				$options['proxy']->use_authentication = true;
 				$options['proxy']->user               = $proxy->username();
 				$options['proxy']->pass               = $proxy->password();
 			}
 		}
 
 		// Avoid issues where mbstring.func_overload is enabled.
 		mbstring_binary_safe_encoding();
 
 		try {
 			$requests_response = Requests::request( $url, $headers, $data, $type, $options );
 
 			// Convert the response into an array.
 			$http_response = new WP_HTTP_Requests_Response( $requests_response, $parsed_args['filename'] );
 			$response      = $http_response->to_array();
 
 			// Add the original object to the array.
 			$response['http_response'] = $http_response;
 		} catch ( Requests_Exception $e ) {
 			$response = new WP_Error( 'http_request_failed', $e->getMessage() );
 		}
 
 		reset_mbstring_encoding();
 
 		/**
 		 * 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          $parsed_args HTTP request arguments.
 		 * @param string         $url         The request URL.
 		 */
 		do_action( 'http_api_debug', $response, 'response', 'Requests', $parsed_args, $url );
 		if ( is_wp_error( $response ) ) {
 			return $response;
 		}
 
 		if ( ! $parsed_args['blocking'] ) {
 			return array(
 				'headers'       => array(),
 				'body'          => '',
 				'response'      => array(
 					'code'    => false,
 					'message' => false,
 				),
 				'cookies'       => array(),
 				'http_response' => null,
 			);
 		}
 
 		/**
 		 * Filters the HTTP API response immediately before the response is returned.
 		 *
 		 * @since 2.9.0
 		 *
 		 * @param array  $response    HTTP response.
 		 * @param array  $parsed_args HTTP request arguments.
 		 * @param string $url         The request URL.
 		 */
 		return apply_filters( 'http_response', $response, $parsed_args, $url );
 	}
 
 	/**
 	 * Normalizes cookies for using in Requests.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @param array $cookies Array of cookies to send with the request.
 	 * @return Requests_Cookie_Jar Cookie holder object.
 	 */
 	public static function normalize_cookies( $cookies ) {
 		$cookie_jar = new Requests_Cookie_Jar();
 
 		foreach ( $cookies as $name => $value ) {
 			if ( $value instanceof WP_Http_Cookie ) {
 				$cookie_jar[ $value->name ] = new Requests_Cookie( $value->name, $value->value, $value->get_attributes(), array( 'host-only' => $value->host_only ) );
 			} elseif ( is_scalar( $value ) ) {
 				$cookie_jar[ $name ] = new Requests_Cookie( $name, $value );
 			}
 		}
 
 		return $cookie_jar;
 	}
 
 	/**
 	 * Match redirect behaviour to browser handling.
 	 *
 	 * Changes 302 redirects from POST to GET to match browser handling. Per
 	 * RFC 7231, user agents can deviate from the strict reading of the
 	 * specification for compatibility purposes.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @param string            $location URL to redirect to.
 	 * @param array             $headers  Headers for the redirect.
 	 * @param string|array      $data     Body to send with the request.
 	 * @param array             $options  Redirect request options.
 	 * @param Requests_Response $original Response object.
 	 */
 	public static function browser_redirect_compatibility( $location, $headers, $data, &$options, $original ) {
 		// Browser compatibility.
 		if ( 302 === $original->status_code ) {
 			$options['type'] = Requests::GET;
 		}
 	}
 
 	/**
 	 * Validate redirected URLs.
 	 *
 	 * @since 4.7.5
 	 *
 	 * @throws Requests_Exception On unsuccessful URL validation.
 	 * @param string $location URL to redirect to.
 	 */
 	public static function validate_redirects( $location ) {
 		if ( ! wp_http_validate_url( $location ) ) {
 			throw new Requests_Exception( __( 'A valid URL was not provided.' ), 'wp_http.redirect_failed_validation' );
 		}
 	}
 
 	/**
 	 * Tests which transports are capable of supporting the request.
 	 *
 	 * @since 3.2.0
 	 *
 	 * @param array  $args Request arguments.
 	 * @param string $url  URL to request.
 	 * @return string|false 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 ) {
 		$transports = array( 'curl', 'streams' );
 
 		/**
 		 * Filters which HTTP transports are available and in what order.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param string[] $transports 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', $transports, $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 ) {
 			if ( in_array( $transport, $transports, true ) ) {
 				$transport = ucfirst( $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
 	 * @deprecated 5.1.0 Use WP_Http::request()
 	 * @see WP_Http::request()
 	 *
 	 * @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 );
 
 		/** This action is documented in wp-includes/class-http.php */
 		do_action( 'http_api_debug', $response, 'response', $class, $args, $url );
 
 		if ( is_wp_error( $response ) ) {
 			return $response;
 		}
 
 		/** This filter is documented in wp-includes/class-http.php */
 		return apply_filters( 'http_response', $response, $args, $url );
 	}
 
 	/**
 	 * Uses the POST HTTP method.
 	 *
 	 * Used for sending data that is expected to be in the body.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @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.
 	 */
 	public function post( $url, $args = array() ) {
 		$defaults    = array( 'method' => 'POST' );
 		$parsed_args = wp_parse_args( $args, $defaults );
 		return $this->request( $url, $parsed_args );
 	}
 
 	/**
 	 * Uses the GET HTTP method.
 	 *
 	 * Used for sending data that is expected to be in the body.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @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.
 	 */
 	public function get( $url, $args = array() ) {
 		$defaults    = array( 'method' => 'GET' );
 		$parsed_args = wp_parse_args( $args, $defaults );
 		return $this->request( $url, $parsed_args );
 	}
 
 	/**
 	 * Uses the HEAD HTTP method.
 	 *
 	 * Used for sending data that is expected to be in the body.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @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.
 	 */
 	public function head( $url, $args = array() ) {
 		$defaults    = array( 'method' => 'HEAD' );
 		$parsed_args = wp_parse_args( $args, $defaults );
 		return $this->request( $url, $parsed_args );
 	}
 
 	/**
 	 * Parses the responses and splits the parts into headers and body.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param string $strResponse The full response string.
 	 * @return array {
 	 *     Array with response headers and body.
 	 *
 	 *     @type string $headers HTTP response headers.
 	 *     @type string $body    HTTP response body.
 	 * }
 	 */
 	public static function processResponse( $strResponse ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 		$res = explode( "\r\n\r\n", $strResponse, 2 );
 
 		return array(
 			'headers' => $res[0],
 			'body'    => isset( $res[1] ) ? $res[1] : '',
 		);
 	}
 
 	/**
 	 * Transforms header string into an array.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param string|array $headers The original headers. If a string is passed, it will be converted
 	 *                              to an array. If an array is passed, then it is assumed to be
 	 *                              raw header data with numeric keys with the headers as the values.
 	 *                              No headers must be passed that were already processed.
 	 * @param string       $url     Optional. The URL that was requested. Default empty.
 	 * @return array {
 	 *     Processed string headers. If duplicate headers are encountered,
 	 *     then a numbered array is returned as the value of that header-key.
 	 *
 	 *     @type array            $response {
 	 *          @type int    $code    The response status code. Default 0.
 	 *          @type string $message The response message. Default empty.
 	 *     }
 	 *     @type array            $newheaders The processed header data as a multidimensional array.
 	 *     @type WP_Http_Cookie[] $cookies    If the original headers contain the 'Set-Cookie' key,
 	 *                                        an array containing `WP_Http_Cookie` objects is returned.
 	 * }
 	 */
 	public static function processHeaders( $headers, $url = '' ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 		// Split headers, one per array element.
 		if ( is_string( $headers ) ) {
 			// 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).
 			 */
 			$headers = preg_replace( '/\n[ \t]/', ' ', $headers );
 			// 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.
 		 */
 		for ( $i = count( $headers ) - 1; $i >= 0; $i-- ) {
 			if ( ! empty( $headers[ $i ] ) && false === strpos( $headers[ $i ], ':' ) ) {
 				$headers = array_splice( $headers, $i );
 				break;
 			}
 		}
 
 		$cookies    = array();
 		$newheaders = array();
 		foreach ( (array) $headers as $tempheader ) {
 			if ( empty( $tempheader ) ) {
 				continue;
 			}
 
 			if ( false === strpos( $tempheader, ':' ) ) {
 				$stack   = explode( ' ', $tempheader, 3 );
 				$stack[] = '';
 				list( , $response['code'], $response['message']) = $stack;
 				continue;
 			}
 
 			list($key, $value) = explode( ':', $tempheader, 2 );
 
 			$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 );
 			}
 		}
 
 		// Cast the Response Code to an int.
 		$response['code'] = (int) $response['code'];
 
 		return array(
 			'response' => $response,
 			'headers'  => $newheaders,
 			'cookies'  => $cookies,
 		);
 	}
 
 	/**
 	 * Takes the arguments for a ::request() and checks for the cookie array.
 	 *
 	 * 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.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param array $r Full array of args passed into ::request()
 	 */
 	public static function buildCookieHeader( &$r ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 		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;
 		}
 	}
 
 	/**
 	 * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.
 	 *
 	 * Based off the HTTP http_encoding_dechunk function.
 	 *
 	 * @link https://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param string $body Body content.
 	 * @return string Chunked decoded body on success or raw body on failure.
 	 */
 	public static function chunkTransferDecode( $body ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
 		// The body is not chunked encoded or is malformed.
 		if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) ) {
 			return $body;
 		}
 
 		$parsed_body = '';
 
 		// We'll be altering $body, so need a backup in case of error.
 		$body_original = $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] );
 			$chunk_length = strlen( $match[0] );
 
 			// Parse out the chunk of data.
 			$parsed_body .= substr( $body, $chunk_length, $length );
 
 			// Remove the chunk from the raw data.
 			$body = substr( $body, $length + $chunk_length );
 
 			// End of the document.
 			if ( '0' === trim( $body ) ) {
 				return $parsed_body;
 			}
 		}
 	}
 
 	/**
 	 * Determines whether an HTTP API request to the given URL should be blocked.
 	 *
 	 * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will
 	 * prevent plugins from working and core functionality, if you don't include `api.wordpress.org`.
 	 *
 	 * You block external URL requests by defining `WP_HTTP_BLOCK_EXTERNAL` as true in your `wp-config.php`
 	 * file and this will only allow localhost and your site to make requests. The constant
 	 * `WP_ACCESSIBLE_HOSTS` will allow additional hosts to go through for requests. The format of the
 	 * `WP_ACCESSIBLE_HOSTS` constant is a comma separated list of hostnames to allow, wildcard domains
 	 * are supported, eg `*.wordpress.org` will allow for all subdomains of `wordpress.org` to be contacted.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
 	 * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS
 	 *
 	 * @param string $uri URI of url.
 	 * @return bool True to block, false to allow.
 	 */
 	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;
 		}
 
 		$check = parse_url( $uri );
 		if ( ! $check ) {
 			return true;
 		}
 
 		$home = parse_url( get_option( 'siteurl' ) );
 
 		// Don't block requests back to ourselves by default.
 		if ( 'localhost' === $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) {
 			/**
 			 * Filters whether to block local HTTP API requests.
 			 *
 			 * A local request is one to `localhost` or to the same host as the site itself.
 			 *
 			 * @since 2.8.0
 			 *
 			 * @param bool $block Whether to block local requests. Default false.
 			 */
 			return apply_filters( 'block_local_requests', false );
 		}
 
 		if ( ! defined( 'WP_ACCESSIBLE_HOSTS' ) ) {
 			return true;
 		}
 
 		static $accessible_hosts = null;
 		static $wildcard_regex   = array();
 		if ( null === $accessible_hosts ) {
 			$accessible_hosts = preg_split( '|,\s*|', WP_ACCESSIBLE_HOSTS );
 
 			if ( false !== strpos( WP_ACCESSIBLE_HOSTS, '*' ) ) {
 				$wildcard_regex = array();
 				foreach ( $accessible_hosts as $host ) {
 					$wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
 				}
 				$wildcard_regex = '/^(' . implode( '|', $wildcard_regex ) . ')$/i';
 			}
 		}
 
 		if ( ! empty( $wildcard_regex ) ) {
 			return ! preg_match( $wildcard_regex, $check['host'] );
 		} else {
 			return ! in_array( $check['host'], $accessible_hosts, true ); // Inverse logic, if it's in the array, then don't block it.
 		}
 
 	}
 
 	/**
 	 * Used as a wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7.
 	 *
 	 * @deprecated 4.4.0 Use wp_parse_url()
 	 * @see wp_parse_url()
 	 *
 	 * @param string $url The URL to parse.
 	 * @return bool|array False on failure; Array of URL components on success;
 	 *                    See parse_url()'s return values.
 	 */
 	protected static function parse_url( $url ) {
 		_deprecated_function( __METHOD__, '4.4.0', 'wp_parse_url()' );
 		return wp_parse_url( $url );
 	}
 
 	/**
 	 * Converts a relative URL to an absolute URL relative to a given URL.
 	 *
 	 * If an Absolute URL is provided, no processing of that URL is done.
 	 *
 	 * @since 3.4.0
 	 *
 	 * @param string $maybe_relative_path The URL which might be relative.
 	 * @param string $url                 The URL which $maybe_relative_path is relative to.
 	 * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned.
 	 */
 	public static function make_absolute_url( $maybe_relative_path, $url ) {
 		if ( empty( $url ) ) {
 			return $maybe_relative_path;
 		}
 
 		$url_parts = wp_parse_url( $url );
 		if ( ! $url_parts ) {
 			return $maybe_relative_path;
 		}
 
 		$relative_url_parts = wp_parse_url( $maybe_relative_path );
 		if ( ! $relative_url_parts ) {
 			return $maybe_relative_path;
 		}
 
 		// Check for a scheme on the 'relative' URL.
 		if ( ! empty( $relative_url_parts['scheme'] ) ) {
 			return $maybe_relative_path;
 		}
 
 		$absolute_path = $url_parts['scheme'] . '://';
 
 		// Schemeless URLs will make it this far, so we check for a host in the relative URL
 		// and convert it to a protocol-URL.
 		if ( isset( $relative_url_parts['host'] ) ) {
 			$absolute_path .= $relative_url_parts['host'];
 			if ( isset( $relative_url_parts['port'] ) ) {
 				$absolute_path .= ':' . $relative_url_parts['port'];
 			}
 		} else {
 			$absolute_path .= $url_parts['host'];
 			if ( isset( $url_parts['port'] ) ) {
 				$absolute_path .= ':' . $url_parts['port'];
 			}
 		}
 
 		// Start off with the absolute URL path.
 		$path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';
 
 		// 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'];
 
 			// 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 );
 
 			// Build the new path.
 			$path .= $relative_url_parts['path'];
 
 			// Strip all /path/../ out of the path.
 			while ( strpos( $path, '../' ) > 1 ) {
 				$path = preg_replace( '![^/]+/\.\./!', '', $path );
 			}
 
 			// Strip any final leading ../ from the path.
 			$path = preg_replace( '!^/(\.\./)+!', '', $path );
 		}
 
 		// Add the query string.
 		if ( ! empty( $relative_url_parts['query'] ) ) {
 			$path .= '?' . $relative_url_parts['query'];
 		}
 
 		return $absolute_path . '/' . ltrim( $path, '/' );
 	}
 
 	/**
 	 * Handles an HTTP redirect and follows it if appropriate.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @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 array|false|WP_Error An HTTP API response array if the redirect is successfully followed,
 	 *                              false if no redirect is present, or a WP_Error object if there's an error.
 	 */
 	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;
 		}
 
 		// Only perform redirections on redirection http codes.
 		if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 ) {
 			return false;
 		}
 
 		// Don't redirect if we've run out of redirects.
 		if ( $args['redirection']-- <= 0 ) {
 			return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
 		}
 
 		$redirect_location = $response['headers']['location'];
 
 		// If there were multiple Location headers, use the last header specified.
 		if ( is_array( $redirect_location ) ) {
 			$redirect_location = array_pop( $redirect_location );
 		}
 
 		$redirect_location = WP_Http::make_absolute_url( $redirect_location, $url );
 
 		// POST requests should not POST to a redirected location.
 		if ( 'POST' === $args['method'] ) {
 			if ( in_array( $response['response']['code'], array( 302, 303 ), true ) ) {
 				$args['method'] = 'GET';
 			}
 		}
 
 		// Include valid cookies in the redirect process.
 		if ( ! empty( $response['cookies'] ) ) {
 			foreach ( $response['cookies'] as $cookie ) {
 				if ( $cookie->test( $redirect_location ) ) {
 					$args['cookies'][] = $cookie;
 				}
 			}
 		}
 
 		return wp_remote_request( $redirect_location, $args );
 	}
 
 	/**
 	 * Determines if a specified string represents an IP address or not.
 	 *
 	 * 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.
 	 *
 	 * @link http://home.deds.nl/~aeron/regex/ for IPv6 regex.
 	 *
 	 * @since 3.7.0
 	 *
 	 * @param string $maybe_ip A suspected IP address.
 	 * @return int|false Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure
 	 */
 	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;
 		}
 
 		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 false;
 	}
 
 }