PHP / Curl: проверка заголовков ответов перед загрузкой тела

Использование Curl в PHP, есть ли способ проверить заголовки HTTP-ответа перед загрузкой тела? Предположим, что я делаю запрос GET на некоторый URI, и я хочу захватить контент, только если Content-type – text/html . Я знаю, что сначала могу сделать запрос HEAD, а затем решить, следует ли использовать GET, но возможно ли это только в одном запросе?

Я в основном ищу эквивалент следующего кода C #:

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://some.uri"); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if(response.ContentType.Equals("text/html")) { string body = new StreamReader(response.GetResponseStream()).ReadToEnd(); } else { // do nothing }

Является ли это возможным?

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Да, я получил вас, вы можете использовать CURLOPT_WRITEFUNCTION в этом случае.
Чтобы сделать вещи довольно быстрыми, я использую свой собственный класс curl во всех моих проектах.
Позвольте мне опубликовать это также.
См. Мой код ниже.

 <?php require_once( "curl.class.php" ); /** variable to store response body **/ $response_body = null; /** total size of header in response **/ $header_size = null; /** initialize the curl object **/ $curl = new ipCurl( "http://example.com/images/someimage.jpg" ); /** set a read callback **/ $curl->setReadCallback( "my_read_callback" ); /** Include header in response **/ $curl->includeHeader(); /** start curl **/ $curl->createCurl(); if ( $curl->getError() !== 0 ) { /** something went wrong, print the error message, and error code **/ echo $curl->getError().":".$curl->getErrorMessage(); if ( $curl->getError() === 23 ) { // its not an image file (Failed writing body....) } } else { /** Everything fine, lets parse the body from response **/ $response_body = substr( $response_body, $header_size ); file_put_contents( "image.jpg", $response_body ); } /** The function for our curl write callback **/ function my_read_callback( &$ch, $data ) { global $response_body, $header_size; /** Get the content type **/ $content_type = trim( curl_getinfo( $ch, CURLINFO_CONTENT_TYPE ) ); /** Give it time to get the content-type string from header **/ if ( !empty( $content_type ) ) { /** stop executing curl if its not an image **/ if ( $content_type !== "image/jpeg" ) { return false; } } /** size of the header **/ $header_size = curl_getinfo( $ch, CURLINFO_HEADER_SIZE ); /** append resposne body to $response_body **/ $response_body .= $data; /** return current response length **/ return strlen( $data ); } ?>

curl.class.php файла curl.class.php

 <?php class ipCurl { private $ch = null; private $url = null; private $_error = 0; private $_errmsg = null; private $_header = null; private $_webpage = null; private $_status = 0; public function __construct( $url = null ) { $this->url = $url; if ( !function_exists( "curl_init" ) ) { throw new Exception( "Fatal Error: Module 'Curl' is not installed properly" ); } $this->ch = curl_init(); curl_setopt( $this->ch, CURLOPT_RETURNTRANSFER, true ); curl_setopt( $this->ch, CURLOPT_FRESH_CONNECT, false ); curl_setopt( $this->ch, CURLOPT_FORBID_REUSE, false ); $this->setTimout( 40 ); $this->setConnTimout( 30 ); $this->followLocation(); $this->setMaxRedirects( 4 ); $this->excludeHeader(); $this->includeBody(); $this->verifySSL(); $this->setBinaryTransfer(); $this->setReferer( $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"] ); $this->setUserAgent(); return $this; } public function __destruct() { curl_close( $this->ch ); $this->ch = null; } public function setReadCallback( $callback = null ) { curl_setopt( $this->ch, CURLOPT_WRITEFUNCTION, $callback ); return $this; } public function setProgressCallback( $callback = null, $buffer = 128 ) { curl_setopt( $this->ch, CURLOPT_NOPROGRESS, false ); curl_setopt( $this->ch, CURLOPT_PROGRESSFUNCTION, $callback ); curl_setopt( $this->ch, CURLOPT_BUFFERSIZE, $buffer ); return $this; } public function includeHeader() { curl_setopt( $this->ch, CURLOPT_HEADER, true ); return $this; } public function excludeHeader() { curl_setopt( $this->ch, CURLOPT_HEADER, false ); return $this; } public function includeBody() { curl_setopt( $this->ch, CURLOPT_NOBODY, false ); return $this; } public function excludeBody() { curl_setopt( $this->ch, CURLOPT_NOBODY, true ); return $this; } public function setMaxRedirects( $redirects = 4 ) { if ( $this->is_safe_mode() ) { return $this; } curl_setopt( $this->ch, CURLOPT_MAXREDIRS, $redirects ); return $this; } public function followLocation() { if ( $this->is_safe_mode() ) { return $this->unfollowLocation(); } curl_setopt( $this->ch, CURLOPT_FOLLOWLOCATION, true ); return $this; } public function unfollowLocation() { curl_setopt( $this->ch, CURLOPT_FOLLOWLOCATION, false ); return $this; } public function setReferer( $referer = null ) { curl_setopt( $this->ch, CURLOPT_REFERER, $referer ); return $this; } public function setBinaryTransfer( $binary = false ) { curl_setopt( $this->ch, CURLOPT_BINARYTRANSFER, $binary ); return $this; } public function setTimout( $timeout ) { curl_setopt( $this->ch, CURLOPT_TIMEOUT, $timeout ); return $this; } public function setConnTimout( $timeout ) { curl_setopt( $this->ch, CURLOPT_CONNECTTIMEOUT, $timeout ); return $this; } public function setUserAgent( $userAgent = null ) { $userAgent = ( !$userAgent ) ? "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31" : $userAgent; curl_setopt( $this->ch, CURLOPT_USERAGENT, $userAgent ); return $this; } public function setProxy( $url = null, $port = 0, $username = null, $password = null ) { curl_setopt( $this->ch, CURLOPT_PROXYAUTH, CURLAUTH_BASIC ); curl_setopt( $this->ch, CURLOPT_PROXY, $url.( ( $port ) > 0 ? ":".$port : null ) ); if ( $port > 0 ) { curl_setopt( $this->ch, CURLOPT_PROXYPORT, $port ); } if ( $username ) { curl_setopt( $this->ch, CURLOPT_PROXYUSERPWD, $username.":".$password ); } return $this; } public function setAuth( $username = null, $password = null ) { curl_setopt( $this->ch, CURLOPT_USERPWD, $username.':'.$password ); return $this; } public function setCookiFile( $file = "cookie.txt" ) { if ( !$file ) { return $this; } curl_setopt( $this->ch, CURLOPT_COOKIEJAR, $file ); curl_setopt( $this->ch, CURLOPT_COOKIEFILE, $file ); return $this; } public function verifySSL( $ssl = false ) { if ( !$ssl ) { curl_setopt( $this->ch, CURLOPT_SSL_VERIFYPEER, false ); curl_setopt( $this->ch, CURLOPT_SSL_VERIFYHOST, 2 ); } else { curl_setopt( $this->ch, CURLOPT_SSL_VERIFYPEER, true ); } return $this; } public function setPost( $postFields = null, $keep_array = false ) { if ( is_array( $postFields ) && !$keep_array ) { $postFields = http_build_query( $postFields ); } curl_setopt( $this->ch, CURLOPT_POST, true ); curl_setopt( $this->ch, CURLOPT_POSTFIELDS, $postFields ); return $this; } public function setFile( $file = null ) { if ( $file !== null ) { $file = realpath( $file ); } if ( $file && is_readable( $file ) ) { $fp = fopen( $file, "w" ); curl_setopt( $this->ch, CURLOPT_FILE, $fp ); } return $this; } public function setHeader( $header = array( "Expect:" ) ) { curl_setopt( $this->ch, CURLOPT_HTTPHEADER, $header ); return $this; } public function createCurl( $url = null ) { $url = ( $url ) ? trim( $url ) : trim( $this->url ); if ( !$url ) { throw new Exception( "Fatal Error: you must provide a valid url before calling 'createCurl'" ); } curl_setopt( $this->ch, CURLOPT_URL, $url ); $this->_webpage = curl_exec( $this->ch ); $this->_status = (int)curl_getinfo( $this->ch, CURLINFO_HTTP_CODE ); $this->_error = (int)curl_errno( $this->ch ); $this->_errmsg = curl_error( $this->ch ); $this->_header = curl_getinfo( $this->ch ); if ( !$this->_errmsg ) { $this->_errmsg = $this->parse_http_code( $this->_status ); } return $this; } private function parse_http_code( $code = 404 ) { $code = (int)$code; if ( !class_exists( "ipStatusCodes" ) ) { return null; } return ipStatusCodes::info( $code ); } private function is_safe_mode() { return ( @ini_get( 'open_basedir' ) != '' && @ini_get( 'safe_mode' ) != 'Off' ); } public function getStatus() { return $this->_status; } public function getResponse() { return $this->_webpage; } public function getHeader() { return $this->_header; } public function getError() { return $this->_error; } public function getErrorMessage() { return $this->_errmsg; } } ?>

Я не заставляю вас использовать мой класс, вы можете просто использовать его так же …

 <?php curl_setopt( $ch, CURLOPT_WRITEFUNCTION, "my_callback" ); function my_callback() { // same like the "my_read_callback" function in my above code } ?>

с завитком заголовки могут быть прочитаны отдельно после выполнения запроса. выполнив следующий код

 $ch = curl_init(); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_VERBOSE, 1); curl_setopt($ch, CURLOPT_HEADER, 1); // Then, after your curl_exec call: $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE); $header = substr($response, 0, $header_size); $body = substr($response, $header_size);