1 <?php

     2 /**

     3  * Simple and uniform HTTP request API.

     4  *

     5  * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk

     6  * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations.

     7  *

     8  * @link http://trac.wordpress.org/ticket/4779 HTTP API Proposal

     9  *

    10  * @package WordPress

    11  * @subpackage HTTP

    12  * @since 2.7.0

    13  */

    14 

    15 /**

    16  * WordPress HTTP Class for managing HTTP Transports and making HTTP requests.

    17  *

    18  * This class is used to consistently make outgoing HTTP requests easy for developers

    19  * while still being compatible with the many PHP configurations under which

    20  * WordPress runs.

    21  *

    22  * Debugging includes several actions, which pass different variables for debugging the HTTP API.

    23  *

    24  * @package WordPress

    25  * @subpackage HTTP

    26  * @since 2.7.0

    27  */

    28 class WP_Http {

    29 

    30 	/**

    31 	 * Send a HTTP request to a URI.

    32 	 *

    33 	 * The body and headers are part of the arguments. The 'body' argument is for the body and will

    34 	 * accept either a string or an array. The 'headers' argument should be an array, but a string

    35 	 * is acceptable. If the 'body' argument is an array, then it will automatically be escaped

    36 	 * using http_build_query().

    37 	 *

    38 	 * The only URI that are supported in the HTTP Transport implementation are the HTTP and HTTPS

    39 	 * protocols.

    40 	 *

    41 	 * The defaults are 'method', 'timeout', 'redirection', 'httpversion', 'blocking' and

    42 	 * 'user-agent'.

    43 	 *

    44 	 * Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports technically allow

    45 	 * others, but should not be assumed. The 'timeout' is used to sent how long the connection

    46 	 * should stay open before failing when no response. 'redirection' is used to track how many

    47 	 * redirects were taken and used to sent the amount for other transports, but not all transports

    48 	 * accept setting that value.

    49 	 *

    50 	 * The 'httpversion' option is used to sent the HTTP version and accepted values are '1.0', and

    51 	 * '1.1' and should be a string. The 'user-agent' option is the user-agent and is used to

    52 	 * replace the default user-agent, which is 'WordPress/WP_Version', where WP_Version is the

    53 	 * value from $wp_version.

    54 	 *

    55 	 * The 'blocking' parameter can be used to specify if the calling code requires the result of

    56 	 * the HTTP request. If set to false, the request will be sent to the remote server, and

    57 	 * processing returned to the calling code immediately, the caller will know if the request

    58 	 * suceeded or failed, but will not receive any response from the remote server.

    59 	 *

    60 	 * @access public

    61 	 * @since 2.7.0

    62 	 *

    63 	 * @param string $url URI resource.

    64 	 * @param str|array $args Optional. Override the defaults.

    65 	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

    66 	 */

    67 	function request( $url, $args = array() ) {

    68 		global $wp_version;

    69 

    70 		$defaults = array(

    71 			'method' => 'GET',

    72 			'timeout' => apply_filters( 'http_request_timeout', 5),

    73 			'redirection' => apply_filters( 'http_request_redirection_count', 5),

    74 			'httpversion' => apply_filters( 'http_request_version', '1.0'),

    75 			'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),

    76 			'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),

    77 			'blocking' => true,

    78 			'headers' => array(),

    79 			'cookies' => array(),

    80 			'body' => null,

    81 			'compress' => false,

    82 			'decompress' => true,

    83 			'sslverify' => true,

    84 			'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt',

    85 			'stream' => false,

    86 			'filename' => null,

    87 			'limit_response_size' => null,

    88 		);

    89 

    90 		// Pre-parse for the HEAD checks.

    91 		$args = wp_parse_args( $args );

    92 

    93 		// By default, Head requests do not cause redirections.

    94 		if ( isset($args['method']) && 'HEAD' == $args['method'] )

    95 			$defaults['redirection'] = 0;

    96 

    97 		$r = wp_parse_args( $args, $defaults );

    98 		$r = apply_filters( 'http_request_args', $r, $url );

    99 

   100 		// The transports decrement this, store a copy of the original value for loop purposes.

   101 		if ( ! isset( $r['_redirection'] ) )

   102 			$r['_redirection'] = $r['redirection'];

   103 

   104 		// Allow plugins to short-circuit the request

   105 		$pre = apply_filters( 'pre_http_request', false, $r, $url );

   106 		if ( false !== $pre )

   107 			return $pre;

   108 

   109 		if ( function_exists( 'wp_kses_bad_protocol' ) ) {

   110 			if ( $r['reject_unsafe_urls'] )

   111 				$url = wp_http_validate_url( $url );

   112 			$url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );

   113 		}

   114 

   115 		$arrURL = @parse_url( $url );

   116 

   117 		if ( empty( $url ) || empty( $arrURL['scheme'] ) )

   118 			return new WP_Error('http_request_failed', __('A valid URL was not provided.'));

   119 

   120 		if ( $this->block_request( $url ) )

   121 			return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) );

   122 

   123 		// Determine if this is a https call and pass that on to the transport functions

   124 		// so that we can blacklist the transports that do not support ssl verification

   125 		$r['ssl'] = $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl';

   126 

   127 		// Determine if this request is to OUR install of WordPress

   128 		$homeURL = parse_url( get_bloginfo( 'url' ) );

   129 		$r['local'] = $homeURL['host'] == $arrURL['host'] || 'localhost' == $arrURL['host'];

   130 		unset( $homeURL );

   131 

   132 		// If we are streaming to a file but no filename was given drop it in the WP temp dir

   133 		// and pick its name using the basename of the $url

   134 		if ( $r['stream']  && empty( $r['filename'] ) )

   135 			$r['filename'] = get_temp_dir() . basename( $url );

   136 

   137 		// Force some settings if we are streaming to a file and check for existence and perms of destination directory

   138 		if ( $r['stream'] ) {

   139 			$r['blocking'] = true;

   140 			if ( ! wp_is_writable( dirname( $r['filename'] ) ) )

   141 				return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );

   142 		}

   143 

   144 		if ( is_null( $r['headers'] ) )

   145 			$r['headers'] = array();

   146 

   147 		if ( ! is_array( $r['headers'] ) ) {

   148 			$processedHeaders = WP_Http::processHeaders( $r['headers'], $url );

   149 			$r['headers'] = $processedHeaders['headers'];

   150 		}

   151 

   152 		if ( isset( $r['headers']['User-Agent'] ) ) {

   153 			$r['user-agent'] = $r['headers']['User-Agent'];

   154 			unset( $r['headers']['User-Agent'] );

   155 		}

   156 

   157 		if ( isset( $r['headers']['user-agent'] ) ) {

   158 			$r['user-agent'] = $r['headers']['user-agent'];

   159 			unset( $r['headers']['user-agent'] );

   160 		}

   161 

   162 		if ( '1.1' == $r['httpversion'] && !isset( $r['headers']['connection'] ) ) {

   163 			$r['headers']['connection'] = 'close';

   164 		}

   165 

   166 		// Construct Cookie: header if any cookies are set

   167 		WP_Http::buildCookieHeader( $r );

   168 

   169 		// Avoid issues where mbstring.func_overload is enabled

   170 		mbstring_binary_safe_encoding();

   171 

   172 		if ( ! isset( $r['headers']['Accept-Encoding'] ) ) {

   173 			if ( $encoding = WP_Http_Encoding::accept_encoding( $url, $r ) )

   174 				$r['headers']['Accept-Encoding'] = $encoding;

   175 		}

   176 

   177 		if ( ( ! is_null( $r['body'] ) && '' != $r['body'] ) || 'POST' == $r['method'] || 'PUT' == $r['method'] ) {

   178 			if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {

   179 				$r['body'] = http_build_query( $r['body'], null, '&' );

   180 

   181 				if ( ! isset( $r['headers']['Content-Type'] ) )

   182 					$r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' );

   183 			}

   184 

   185 			if ( '' === $r['body'] )

   186 				$r['body'] = null;

   187 

   188 			if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) )

   189 				$r['headers']['Content-Length'] = strlen( $r['body'] );

   190 		}

   191 

   192 		$response = $this->_dispatch_request( $url, $r );

   193 

   194 		reset_mbstring_encoding();

   195 

   196 		if ( is_wp_error( $response ) )

   197 			return $response;

   198 

   199 		// Append cookies that were used in this request to the response

   200 		if ( ! empty( $r['cookies'] ) ) {

   201 			$cookies_set = wp_list_pluck( $response['cookies'], 'name' );

   202 			foreach ( $r['cookies'] as $cookie ) {

   203 				if ( ! in_array( $cookie->name, $cookies_set ) && $cookie->test( $url ) ) {

   204 					$response['cookies'][] = $cookie;

   205 				}

   206 			}

   207 		}

   208 

   209 		return $response;

   210 	}

   211 

   212 	/**

   213 	 * Tests which transports are capable of supporting the request.

   214 	 *

   215 	 * @since 3.2.0

   216 	 * @access private

   217 	 *

   218 	 * @param array $args Request arguments

   219 	 * @param string $url URL to Request

   220 	 *

   221 	 * @return string|bool Class name for the first transport that claims to support the request. False if no transport claims to support the request.

   222 	 */

   223 	public function _get_first_available_transport( $args, $url = null ) {

   224 		$request_order = apply_filters( 'http_api_transports', array( 'curl', 'streams' ), $args, $url );

   225 

   226 		// Loop over each transport on each HTTP request looking for one which will serve this request's needs

   227 		foreach ( $request_order as $transport ) {

   228 			$class = 'WP_HTTP_' . $transport;

   229 

   230 			// Check to see if this transport is a possibility, calls the transport statically

   231 			if ( !call_user_func( array( $class, 'test' ), $args, $url ) )

   232 				continue;

   233 

   234 			return $class;

   235 		}

   236 

   237 		return false;

   238 	}

   239 

   240 	/**

   241 	 * Dispatches a HTTP request to a supporting transport.

   242 	 *

   243 	 * Tests each transport in order to find a transport which matches the request arguments.

   244 	 * Also caches the transport instance to be used later.

   245 	 *

   246 	 * The order for requests is cURL, and then PHP Streams.

   247 	 *

   248 	 * @since 3.2.0

   249 	 * @access private

   250 	 *

   251 	 * @param string $url URL to Request

   252 	 * @param array $args Request arguments

   253 	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

   254 	 */

   255 	private function _dispatch_request( $url, $args ) {

   256 		static $transports = array();

   257 

   258 		$class = $this->_get_first_available_transport( $args, $url );

   259 		if ( !$class )

   260 			return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );

   261 

   262 		// Transport claims to support request, instantiate it and give it a whirl.

   263 		if ( empty( $transports[$class] ) )

   264 			$transports[$class] = new $class;

   265 

   266 		$response = $transports[$class]->request( $url, $args );

   267 

   268 		do_action( 'http_api_debug', $response, 'response', $class, $args, $url );

   269 

   270 		if ( is_wp_error( $response ) )

   271 			return $response;

   272 

   273 		return apply_filters( 'http_response', $response, $args, $url );

   274 	}

   275 

   276 	/**

   277 	 * Uses the POST HTTP method.

   278 	 *

   279 	 * Used for sending data that is expected to be in the body.

   280 	 *

   281 	 * @access public

   282 	 * @since 2.7.0

   283 	 *

   284 	 * @param string $url URI resource.

   285 	 * @param str|array $args Optional. Override the defaults.

   286 	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

   287 	 */

   288 	function post($url, $args = array()) {

   289 		$defaults = array('method' => 'POST');

   290 		$r = wp_parse_args( $args, $defaults );

   291 		return $this->request($url, $r);

   292 	}

   293 

   294 	/**

   295 	 * Uses the GET HTTP method.

   296 	 *

   297 	 * Used for sending data that is expected to be in the body.

   298 	 *

   299 	 * @access public

   300 	 * @since 2.7.0

   301 	 *

   302 	 * @param string $url URI resource.

   303 	 * @param str|array $args Optional. Override the defaults.

   304 	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

   305 	 */

   306 	function get($url, $args = array()) {

   307 		$defaults = array('method' => 'GET');

   308 		$r = wp_parse_args( $args, $defaults );

   309 		return $this->request($url, $r);

   310 	}

   311 

   312 	/**

   313 	 * Uses the HEAD HTTP method.

   314 	 *

   315 	 * Used for sending data that is expected to be in the body.

   316 	 *

   317 	 * @access public

   318 	 * @since 2.7.0

   319 	 *

   320 	 * @param string $url URI resource.

   321 	 * @param str|array $args Optional. Override the defaults.

   322 	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

   323 	 */

   324 	function head($url, $args = array()) {

   325 		$defaults = array('method' => 'HEAD');

   326 		$r = wp_parse_args( $args, $defaults );

   327 		return $this->request($url, $r);

   328 	}

   329 

   330 	/**

   331 	 * Parses the responses and splits the parts into headers and body.

   332 	 *

   333 	 * @access public

   334 	 * @static

   335 	 * @since 2.7.0

   336 	 *

   337 	 * @param string $strResponse The full response string

   338 	 * @return array Array with 'headers' and 'body' keys.

   339 	 */

   340 	public static function processResponse($strResponse) {

   341 		$res = explode("\r\n\r\n", $strResponse, 2);

   342 

   343 		return array('headers' => $res[0], 'body' => isset($res[1]) ? $res[1] : '');

   344 	}

   345 

   346 	/**

   347 	 * Transform header string into an array.

   348 	 *

   349 	 * If an array is given then it is assumed to be raw header data with numeric keys with the

   350 	 * headers as the values. No headers must be passed that were already processed.

   351 	 *

   352 	 * @access public

   353 	 * @static

   354 	 * @since 2.7.0

   355 	 *

   356 	 * @param string|array $headers

   357 	 * @param string $url The URL that was requested

   358 	 * @return array Processed string headers. If duplicate headers are encountered,

   359 	 * 					Then a numbered array is returned as the value of that header-key.

   360 	 */

   361 	public static function processHeaders( $headers, $url = '' ) {

   362 		// split headers, one per array element

   363 		if ( is_string($headers) ) {

   364 			// tolerate line terminator: CRLF = LF (RFC 2616 19.3)

   365 			$headers = str_replace("\r\n", "\n", $headers);

   366 			// unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>, <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2)

   367 			$headers = preg_replace('/\n[ \t]/', ' ', $headers);

   368 			// create the headers array

   369 			$headers = explode("\n", $headers);

   370 		}

   371 

   372 		$response = array('code' => 0, 'message' => '');

   373 

   374 		// If a redirection has taken place, The headers for each page request may have been passed.

   375 		// In this case, determine the final HTTP header and parse from there.

   376 		for ( $i = count($headers)-1; $i >= 0; $i-- ) {

   377 			if ( !empty($headers[$i]) && false === strpos($headers[$i], ':') ) {

   378 				$headers = array_splice($headers, $i);

   379 				break;

   380 			}

   381 		}

   382 

   383 		$cookies = array();

   384 		$newheaders = array();

   385 		foreach ( (array) $headers as $tempheader ) {

   386 			if ( empty($tempheader) )

   387 				continue;

   388 

   389 			if ( false === strpos($tempheader, ':') ) {

   390 				$stack = explode(' ', $tempheader, 3);

   391 				$stack[] = '';

   392 				list( , $response['code'], $response['message']) = $stack;

   393 				continue;

   394 			}

   395 

   396 			list($key, $value) = explode(':', $tempheader, 2);

   397 

   398 			$key = strtolower( $key );

   399 			$value = trim( $value );

   400 

   401 			if ( isset( $newheaders[ $key ] ) ) {

   402 				if ( ! is_array( $newheaders[ $key ] ) )

   403 					$newheaders[$key] = array( $newheaders[ $key ] );

   404 				$newheaders[ $key ][] = $value;

   405 			} else {

   406 				$newheaders[ $key ] = $value;

   407 			}

   408 			if ( 'set-cookie' == $key )

   409 				$cookies[] = new WP_Http_Cookie( $value, $url );

   410 		}

   411 

   412 		return array('response' => $response, 'headers' => $newheaders, 'cookies' => $cookies);

   413 	}

   414 

   415 	/**

   416 	 * Takes the arguments for a ::request() and checks for the cookie array.

   417 	 *

   418 	 * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,

   419 	 * which are each parsed into strings and added to the Cookie: header (within the arguments array).

   420 	 * Edits the array by reference.

   421 	 *

   422 	 * @access public

   423 	 * @version 2.8.0

   424 	 * @static

   425 	 *

   426 	 * @param array $r Full array of args passed into ::request()

   427 	 */

   428 	public static function buildCookieHeader( &$r ) {

   429 		if ( ! empty($r['cookies']) ) {

   430 			// Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances

   431 			foreach ( $r['cookies'] as $name => $value ) {

   432 				if ( ! is_object( $value ) )

   433 					$r['cookies'][ $name ] = new WP_HTTP_Cookie( array( 'name' => $name, 'value' => $value ) );

   434 			}

   435 

   436 			$cookies_header = '';

   437 			foreach ( (array) $r['cookies'] as $cookie ) {

   438 				$cookies_header .= $cookie->getHeaderValue() . '; ';

   439 			}

   440 

   441 			$cookies_header = substr( $cookies_header, 0, -2 );

   442 			$r['headers']['cookie'] = $cookies_header;

   443 		}

   444 	}

   445 

   446 	/**

   447 	 * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.

   448 	 *

   449 	 * Based off the HTTP http_encoding_dechunk function.

   450 	 *

   451 	 * @link http://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.

   452 	 *

   453 	 * @access public

   454 	 * @since 2.7.0

   455 	 * @static

   456 	 *

   457 	 * @param string $body Body content

   458 	 * @return string Chunked decoded body on success or raw body on failure.

   459 	 */

   460 	public static function chunkTransferDecode( $body ) {

   461 		// The body is not chunked encoded or is malformed.

   462 		if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) )

   463 			return $body;

   464 

   465 		$parsed_body = '';

   466 		$body_original = $body; // We'll be altering $body, so need a backup in case of error

   467 

   468 		while ( true ) {

   469 			$has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );

   470 			if ( ! $has_chunk || empty( $match[1] ) )

   471 				return $body_original;

   472 

   473 			$length = hexdec( $match[1] );

   474 			$chunk_length = strlen( $match[0] );

   475 

   476 			// Parse out the chunk of data

   477 			$parsed_body .= substr( $body, $chunk_length, $length );

   478 

   479 			// Remove the chunk from the raw data

   480 			$body = substr( $body, $length + $chunk_length );

   481 

   482 			// End of document

   483 			if ( '0' === trim( $body ) )

   484 				return $parsed_body;

   485 		}

   486 	}

   487 

   488 	/**

   489 	 * Block requests through the proxy.

   490 	 *

   491 	 * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will

   492 	 * prevent plugins from working and core functionality, if you don't include api.wordpress.org.

   493 	 *

   494 	 * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true in your wp-config.php

   495 	 * file and this will only allow localhost and your blog to make requests. The constant

   496 	 * WP_ACCESSIBLE_HOSTS will allow additional hosts to go through for requests. The format of the

   497 	 * WP_ACCESSIBLE_HOSTS constant is a comma separated list of hostnames to allow, wildcard domains

   498 	 * are supported, eg *.wordpress.org will allow for all subdomains of wordpress.org to be contacted.

   499 	 *

   500 	 * @since 2.8.0

   501 	 * @link http://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.

   502 	 * @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS

   503 	 *

   504 	 * @param string $uri URI of url.

   505 	 * @return bool True to block, false to allow.

   506 	 */

   507 	function block_request($uri) {

   508 		// We don't need to block requests, because nothing is blocked.

   509 		if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL )

   510 			return false;

   511 

   512 		$check = parse_url($uri);

   513 		if ( ! $check )

   514 			return true;

   515 

   516 		$home = parse_url( get_option('siteurl') );

   517 

   518 		// Don't block requests back to ourselves by default

   519 		if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )

   520 			return apply_filters('block_local_requests', false);

   521 

   522 		if ( !defined('WP_ACCESSIBLE_HOSTS') )

   523 			return true;

   524 

   525 		static $accessible_hosts;

   526 		static $wildcard_regex = false;

   527 		if ( null == $accessible_hosts ) {

   528 			$accessible_hosts = preg_split('|,\s*|', WP_ACCESSIBLE_HOSTS);

   529 

   530 			if ( false !== strpos(WP_ACCESSIBLE_HOSTS, '*') ) {

   531 				$wildcard_regex = array();

   532 				foreach ( $accessible_hosts as $host )

   533 					$wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );

   534 				$wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';

   535 			}

   536 		}

   537 

   538 		if ( !empty($wildcard_regex) )

   539 			return !preg_match($wildcard_regex, $check['host']);

   540 		else

   541 			return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it.

   542 

   543 	}

   544 

   545 	static function make_absolute_url( $maybe_relative_path, $url ) {

   546 		if ( empty( $url ) )

   547 			return $maybe_relative_path;

   548 

   549 		// Check for a scheme

   550 		if ( false !== strpos( $maybe_relative_path, '://' ) )

   551 			return $maybe_relative_path;

   552 

   553 		if ( ! $url_parts = @parse_url( $url ) )

   554 			return $maybe_relative_path;

   555 

   556 		if ( ! $relative_url_parts = @parse_url( $maybe_relative_path ) )

   557 			return $maybe_relative_path;

   558 

   559 		$absolute_path = $url_parts['scheme'] . '://' . $url_parts['host'];

   560 		if ( isset( $url_parts['port'] ) )

   561 			$absolute_path .= ':' . $url_parts['port'];

   562 

   563 		// Start off with the Absolute URL path

   564 		$path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';

   565 

   566 		// If it's a root-relative path, then great

   567 		if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) {

   568 			$path = $relative_url_parts['path'];

   569 

   570 		// Else it's a relative path

   571 		} elseif ( ! empty( $relative_url_parts['path'] ) ) {

   572 			// Strip off any file components from the absolute path

   573 			$path = substr( $path, 0, strrpos( $path, '/' ) + 1 );

   574 

   575 			// Build the new path

   576 			$path .= $relative_url_parts['path'];

   577 

   578 			// Strip all /path/../ out of the path

   579 			while ( strpos( $path, '../' ) > 1 ) {

   580 				$path = preg_replace( '![^/]+/\.\./!', '', $path );

   581 			}

   582 

   583 			// Strip any final leading ../ from the path

   584 			$path = preg_replace( '!^/(\.\./)+!', '', $path );

   585 		}

   586 

   587 		// Add the Query string

   588 		if ( ! empty( $relative_url_parts['query'] ) )

   589 			$path .= '?' . $relative_url_parts['query'];

   590 

   591 		return $absolute_path . '/' . ltrim( $path, '/' );

   592 	}

   593 

   594 	/**

   595 	 * Handles HTTP Redirects and follows them if appropriate.

   596 	 *

   597 	 * @since 3.7.0

   598 	 *

   599 	 * @param string $url The URL which was requested.

   600 	 * @param array $args The Arguements which were used to make the request.

   601 	 * @param array $response The Response of the HTTP request.

   602 	 * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.

   603 	 */

   604 	static function handle_redirects( $url, $args, $response ) {

   605 		// If no redirects are present, or, redirects were not requested, perform no action.

   606 		if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] )

   607 			return false;

   608 

   609 		// Only perform redirections on redirection http codes

   610 		if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 )

   611 			return false;

   612 

   613 		// Don't redirect if we've run out of redirects

   614 		if ( $args['redirection']-- <= 0 )

   615 			return new WP_Error( 'http_request_failed', __('Too many redirects.') );

   616 

   617 		$redirect_location = $response['headers']['location'];

   618 

   619 		// If there were multiple Location headers, use the last header specified

   620 		if ( is_array( $redirect_location ) )

   621 			$redirect_location = array_pop( $redirect_location );

   622 

   623 		$redirect_location = WP_HTTP::make_absolute_url( $redirect_location, $url );

   624 

   625 		// POST requests should not POST to a redirected location

   626 		if ( 'POST' == $args['method'] ) {

   627 			if ( in_array( $response['response']['code'], array( 302, 303 ) ) )

   628 				$args['method'] = 'GET';

   629 		}

   630 

   631 		// Include valid cookies in the redirect process

   632 		if ( ! empty( $response['cookies'] ) ) {

   633 			foreach ( $response['cookies'] as $cookie ) {

   634 				if ( $cookie->test( $redirect_location ) )

   635 					$args['cookies'][] = $cookie;

   636 			}

   637 		}

   638 

   639 		return wp_remote_request( $redirect_location, $args );

   640 	}

   641 

   642 	/**

   643 	 * Determines if a specified string represents an IP address or not.

   644 	 *

   645 	 * This function also detects the type of the IP address, returning either

   646 	 * '4' or '6' to represent a IPv4 and IPv6 address respectively.

   647 	 * This does not verify if the IP is a valid IP, only that it appears to be

   648 	 * an IP address.

   649 	 *

   650 	 * @see http://home.deds.nl/~aeron/regex/ for IPv6 regex

   651 	 *

   652 	 * @since 3.7.0

   653 	 * @static

   654 	 *

   655 	 * @param string $maybe_ip A suspected IP address

   656 	 * @return integer|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure

   657 	 */

   658 	static function is_ip_address( $maybe_ip ) {

   659 		if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) )

   660 			return 4;

   661 

   662 		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, ' []' ) ) )

   663 			return 6;

   664 

   665 		return false;

   666 	}

   667 

   668 }

   669 

   670 /**

   671  * HTTP request method uses PHP Streams to retrieve the url.

   672  *

   673  * @package WordPress

   674  * @subpackage HTTP

   675  *

   676  * @since 2.7.0

   677  * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().

   678  */

   679 class WP_Http_Streams {

   680 	/**

   681 	 * Send a HTTP request to a URI using PHP Streams.

   682 	 *

   683 	 * @see WP_Http::request For default options descriptions.

   684 	 *

   685 	 * @since 2.7.0

   686 	 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().

   687 	 *

   688 	 * @access public

   689 	 * @param string $url URI resource.

   690 	 * @param string|array $args Optional. Override the defaults.

   691 	 * @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys.

   692 	 */

   693 	function request($url, $args = array()) {

   694 		$defaults = array(

   695 			'method' => 'GET', 'timeout' => 5,

   696 			'redirection' => 5, 'httpversion' => '1.0',

   697 			'blocking' => true,

   698 			'headers' => array(), 'body' => null, 'cookies' => array()

   699 		);

   700 

   701 		$r = wp_parse_args( $args, $defaults );

   702 

   703 		if ( isset($r['headers']['User-Agent']) ) {

   704 			$r['user-agent'] = $r['headers']['User-Agent'];

   705 			unset($r['headers']['User-Agent']);

   706 		} else if ( isset($r['headers']['user-agent']) ) {

   707 			$r['user-agent'] = $r['headers']['user-agent'];

   708 			unset($r['headers']['user-agent']);

   709 		}

   710 

   711 		// Construct Cookie: header if any cookies are set

   712 		WP_Http::buildCookieHeader( $r );

   713 

   714 		$arrURL = parse_url($url);

   715 

   716 		$connect_host = $arrURL['host'];

   717 

   718 		$secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' );

   719 		if ( ! isset( $arrURL['port'] ) ) {

   720 			if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) {

   721 				$arrURL['port'] = 443;

   722 				$secure_transport = true;

   723 			} else {

   724 				$arrURL['port'] = 80;

   725 			}

   726 		}

   727 

   728 		if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) {

   729 			if ( isset( $r['headers']['Host'] ) )

   730 				$arrURL['host'] = $r['headers']['Host'];

   731 			else

   732 				$arrURL['host'] = $r['headers']['host'];

   733 			unset( $r['headers']['Host'], $r['headers']['host'] );

   734 		}

   735 

   736 		// Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect to ::1,

   737 		// which fails when the server is not set up for it. For compatibility, always connect to the IPv4 address.

   738 		if ( 'localhost' == strtolower( $connect_host ) )

   739 			$connect_host = '127.0.0.1';

   740 

   741 		$connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host;

   742 

   743 		$is_local = isset( $r['local'] ) && $r['local'];

   744 		$ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];

   745 		if ( $is_local )

   746 			$ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );

   747 		elseif ( ! $is_local )

   748 			$ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );

   749 

   750 		$proxy = new WP_HTTP_Proxy();

   751 

   752 		$context = stream_context_create( array(

   753 			'ssl' => array(

   754 				'verify_peer' => $ssl_verify,

   755 				//'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate()

   756 				'capture_peer_cert' => $ssl_verify,

   757 				'SNI_enabled' => true,

   758 				'cafile' => $r['sslcertificates'],

   759 				'allow_self_signed' => ! $ssl_verify,

   760 			)

   761 		) );

   762 

   763 		$timeout = (int) floor( $r['timeout'] );

   764 		$utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;

   765 		$connect_timeout = max( $timeout, 1 );

   766 

   767 		$connection_error = null; // Store error number

   768 		$connection_error_str = null; // Store error string

   769 

   770 		if ( !WP_DEBUG ) {

   771 			// In the event that the SSL connection fails, silence the many PHP Warnings

   772 			if ( $secure_transport )

   773 				$error_reporting = error_reporting(0);

   774 

   775 			if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )

   776 				$handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );

   777 			else

   778 				$handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );

   779 

   780 			if ( $secure_transport )

   781 				error_reporting( $error_reporting );

   782 

   783 		} else {

   784 			if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )

   785 				$handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );

   786 			else

   787 				$handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );

   788 		}

   789 

   790 		if ( false === $handle ) {

   791 			// SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken

   792 			if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str )

   793 				return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );

   794 

   795 			return new WP_Error('http_request_failed', $connection_error . ': ' . $connection_error_str );

   796 		}

   797 

   798 		// Verify that the SSL certificate is valid for this request

   799 		if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) {

   800 			if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) )

   801 				return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );

   802 		}

   803 

   804 		stream_set_timeout( $handle, $timeout, $utimeout );

   805 

   806 		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.

   807 			$requestPath = $url;

   808 		else

   809 			$requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );

   810 

   811 		if ( empty($requestPath) )

   812 			$requestPath .= '/';

   813 

   814 		$strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";

   815 

   816 		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )

   817 			$strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";

   818 		else

   819 			$strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";

   820 

   821 		if ( isset($r['user-agent']) )

   822 			$strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";

   823 

   824 		if ( is_array($r['headers']) ) {

   825 			foreach ( (array) $r['headers'] as $header => $headerValue )

   826 				$strHeaders .= $header . ': ' . $headerValue . "\r\n";

   827 		} else {

   828 			$strHeaders .= $r['headers'];

   829 		}

   830 

   831 		if ( $proxy->use_authentication() )

   832 			$strHeaders .= $proxy->authentication_header() . "\r\n";

   833 

   834 		$strHeaders .= "\r\n";

   835 

   836 		if ( ! is_null($r['body']) )

   837 			$strHeaders .= $r['body'];

   838 

   839 		fwrite($handle, $strHeaders);

   840 

   841 		if ( ! $r['blocking'] ) {

   842 			stream_set_blocking( $handle, 0 );

   843 			fclose( $handle );

   844 			return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );

   845 		}

   846 

   847 		$strResponse = '';

   848 		$bodyStarted = false;

   849 		$keep_reading = true;

   850 		$block_size = 4096;

   851 		if ( isset( $r['limit_response_size'] ) )

   852 			$block_size = min( $block_size, $r['limit_response_size'] );

   853 

   854 		// If streaming to a file setup the file handle

   855 		if ( $r['stream'] ) {

   856 			if ( ! WP_DEBUG )

   857 				$stream_handle = @fopen( $r['filename'], 'w+' );

   858 			else

   859 				$stream_handle = fopen( $r['filename'], 'w+' );

   860 			if ( ! $stream_handle )

   861 				return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );

   862 

   863 			$bytes_written = 0;

   864 			while ( ! feof($handle) && $keep_reading ) {

   865 				$block = fread( $handle, $block_size );

   866 				if ( ! $bodyStarted ) {

   867 					$strResponse .= $block;

   868 					if ( strpos( $strResponse, "\r\n\r\n" ) ) {

   869 						$process = WP_Http::processResponse( $strResponse );

   870 						$bodyStarted = true;

   871 						$block = $process['body'];

   872 						unset( $strResponse );

   873 						$process['body'] = '';

   874 					}

   875 				}

   876 

   877 				$this_block_size = strlen( $block );

   878 

   879 				if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] )

   880 					$block = substr( $block, 0, ( $r['limit_response_size'] - $bytes_written ) );

   881 

   882 				$bytes_written_to_file = fwrite( $stream_handle, $block );

   883 

   884 				if ( $bytes_written_to_file != $this_block_size ) {

   885 					fclose( $handle );

   886 					fclose( $stream_handle );

   887 					return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );

   888 				}

   889 

   890 				$bytes_written += $bytes_written_to_file;

   891 

   892 				$keep_reading = !isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size'];

   893 			}

   894 

   895 			fclose( $stream_handle );

   896 

   897 		} else {

   898 			$header_length = 0;

   899 			while ( ! feof( $handle ) && $keep_reading ) {

   900 				$block = fread( $handle, $block_size );

   901 				$strResponse .= $block;

   902 				if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) {

   903 					$header_length = strpos( $strResponse, "\r\n\r\n" ) + 4;

   904 					$bodyStarted = true;

   905 				}

   906 				$keep_reading = ( ! $bodyStarted || !isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) );

   907 			}

   908 

   909 			$process = WP_Http::processResponse( $strResponse );

   910 			unset( $strResponse );

   911 

   912 		}

   913 

   914 		fclose( $handle );

   915 

   916 		$arrHeaders = WP_Http::processHeaders( $process['headers'], $url );

   917 

   918 		$response = array(

   919 			'headers' => $arrHeaders['headers'],

   920 			'body' => null, // Not yet processed

   921 			'response' => $arrHeaders['response'],

   922 			'cookies' => $arrHeaders['cookies'],

   923 			'filename' => $r['filename']

   924 		);

   925 

   926 		// Handle redirects

   927 		if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )

   928 			return $redirect_response;

   929 

   930 		// If the body was chunk encoded, then decode it.

   931 		if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )

   932 			$process['body'] = WP_Http::chunkTransferDecode($process['body']);

   933 

   934 		if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )

   935 			$process['body'] = WP_Http_Encoding::decompress( $process['body'] );

   936 

   937 		if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] )

   938 			$process['body'] = substr( $process['body'], 0, $r['limit_response_size'] );

   939 

   940 		$response['body'] = $process['body'];

   941 

   942 		return $response;

   943 	}

   944 

   945 	/**

   946 	 * Verifies the received SSL certificate against it's Common Names and subjectAltName fields

   947 	 *

   948 	 * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if

   949 	 * the certificate is valid for the hostname which was requested.

   950 	 * This function verifies the requested hostname against certificate's subjectAltName field,

   951 	 * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.

   952 	 *

   953 	 * IP Address support is included if the request is being made to an IP address.

   954 	 *

   955 	 * @since 3.7.0

   956 	 * @static

   957 	 *

   958 	 * @param stream $stream The PHP Stream which the SSL request is being made over

   959 	 * @param string $host The hostname being requested

   960 	 * @return bool If the cerficiate presented in $stream is valid for $host

   961 	 */

   962 	static function verify_ssl_certificate( $stream, $host ) {

   963 		$context_options = stream_context_get_options( $stream );

   964 

   965 		if ( empty( $context_options['ssl']['peer_certificate'] ) )

   966 			return false;

   967 

   968 		$cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );

   969 		if ( ! $cert )

   970 			return false;

   971 

   972 		// If the request is being made to an IP address, we'll validate against IP fields in the cert (if they exist)

   973 		$host_type = ( WP_HTTP::is_ip_address( $host ) ? 'ip' : 'dns' );

   974 

   975 		$certificate_hostnames = array();

   976 		if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {

   977 			$match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );

   978 			foreach ( $match_against as $match ) {

   979 				list( $match_type, $match_host ) = explode( ':', $match );

   980 				if ( $host_type == strtolower( trim( $match_type ) ) ) // IP: or DNS:

   981 					$certificate_hostnames[] = strtolower( trim( $match_host ) );

   982 			}

   983 		} elseif ( !empty( $cert['subject']['CN'] ) ) {

   984 			// Only use the CN when the certificate includes no subjectAltName extension

   985 			$certificate_hostnames[] = strtolower( $cert['subject']['CN'] );

   986 		}

   987 

   988 		// Exact hostname/IP matches

   989 		if ( in_array( strtolower( $host ), $certificate_hostnames ) )

   990 			return true;

   991 

   992 		// IP's can't be wildcards, Stop processing

   993 		if ( 'ip' == $host_type )

   994 			return false;

   995 

   996 		// Test to see if the domain is at least 2 deep for wildcard support

   997 		if ( substr_count( $host, '.' ) < 2 )

   998 			return false;

   999 

  1000 		// Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com

  1001 		$wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );

  1002 

  1003 		return in_array( strtolower( $wildcard_host ), $certificate_hostnames );

  1004 	}

  1005 

  1006 	/**

  1007 	 * Whether this class can be used for retrieving an URL.

  1008 	 *

  1009 	 * @static

  1010 	 * @access public

  1011 	 * @since 2.7.0

  1012 	 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().

  1013 	 *

  1014 	 * @return boolean False means this class can not be used, true means it can.

  1015 	 */

  1016 	public static function test( $args = array() ) {

  1017 		if ( ! function_exists( 'stream_socket_client' ) )

  1018 			return false;

  1019 

  1020 		$is_ssl = isset( $args['ssl'] ) && $args['ssl'];

  1021 

  1022 		if ( $is_ssl ) {

  1023 			if ( ! extension_loaded( 'openssl' ) )

  1024 				return false;

  1025 			if ( ! function_exists( 'openssl_x509_parse' ) )

  1026 				return false;

  1027 		}

  1028 

  1029 		return apply_filters( 'use_streams_transport', true, $args );

  1030 	}

  1031 }

  1032 

  1033 /**

  1034  * Deprecated HTTP Transport method which used fsockopen.

  1035  *

  1036  * This class is not used, and is included for backwards compatibility only.

  1037  * All code should make use of WP_HTTP directly through it's API.

  1038  *

  1039  * @see WP_HTTP::request

  1040  *

  1041  * @package WordPress

  1042  * @subpackage HTTP

  1043  *

  1044  * @since 2.7.0

  1045  * @deprecated 3.7.0 Please use WP_HTTP::request() directly

  1046  */

  1047 class WP_HTTP_Fsockopen extends WP_HTTP_Streams {

  1048 	// For backwards compatibility for users who are using the class directly

  1049 }

  1050 

  1051 /**

  1052  * HTTP request method uses Curl extension to retrieve the url.

  1053  *

  1054  * Requires the Curl extension to be installed.

  1055  *

  1056  * @package WordPress

  1057  * @subpackage HTTP

  1058  * @since 2.7.0

  1059  */

  1060 class WP_Http_Curl {

  1061 

  1062 	/**

  1063 	 * Temporary header storage for during requests.

  1064 	 *

  1065 	 * @since 3.2.0

  1066 	 * @access private

  1067 	 * @var string

  1068 	 */

  1069 	private $headers = '';

  1070 

  1071 	/**

  1072 	 * Temporary body storage for during requests.

  1073 	 *

  1074 	 * @since 3.6.0

  1075 	 * @access private

  1076 	 * @var string

  1077 	 */

  1078 	private $body = '';

  1079 

  1080 	/**

  1081 	 * The maximum amount of data to recieve from the remote server

  1082 	 *

  1083 	 * @since 3.6.0

  1084 	 * @access private

  1085 	 * @var int

  1086 	 */

  1087 	private $max_body_length = false;

  1088 

  1089 	/**

  1090 	 * The file resource used for streaming to file.

  1091 	 *

  1092 	 * @since 3.6.0

  1093 	 * @access private

  1094 	 * @var resource

  1095 	 */

  1096 	private $stream_handle = false;

  1097 

  1098 	/**

  1099 	 * Send a HTTP request to a URI using cURL extension.

  1100 	 *

  1101 	 * @access public

  1102 	 * @since 2.7.0

  1103 	 *

  1104 	 * @param string $url

  1105 	 * @param str|array $args Optional. Override the defaults.

  1106 	 * @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys.

  1107 	 */

  1108 	function request($url, $args = array()) {

  1109 		$defaults = array(

  1110 			'method' => 'GET', 'timeout' => 5,

  1111 			'redirection' => 5, 'httpversion' => '1.0',

  1112 			'blocking' => true,

  1113 			'headers' => array(), 'body' => null, 'cookies' => array()

  1114 		);

  1115 

  1116 		$r = wp_parse_args( $args, $defaults );

  1117 

  1118 		if ( isset($r['headers']['User-Agent']) ) {

  1119 			$r['user-agent'] = $r['headers']['User-Agent'];

  1120 			unset($r['headers']['User-Agent']);

  1121 		} else if ( isset($r['headers']['user-agent']) ) {

  1122 			$r['user-agent'] = $r['headers']['user-agent'];

  1123 			unset($r['headers']['user-agent']);

  1124 		}

  1125 

  1126 		// Construct Cookie: header if any cookies are set.

  1127 		WP_Http::buildCookieHeader( $r );

  1128 

  1129 		$handle = curl_init();

  1130 

  1131 		// cURL offers really easy proxy support.

  1132 		$proxy = new WP_HTTP_Proxy();

  1133 

  1134 		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {

  1135