Короче говоря, у меня есть приложение AJAX, которое использует MVC Web API в качестве задней части. Клиент, однако, звонит из другого домена и использует прокси-файл PHP, чтобы обойти проблемы междоменного запроса.
Однако, используя прокси-сервер PHP, веб-API отвечает на определенные запросы с HTTP-заголовком 100 Continue и любые запросы, которые получают это обратно, требуют чрезмерного времени (мы говорим до 2 минут или около того), а также можем вернуть -личный ответ.
Это , по-видимому, известная проблема с cURL, и обходной путь обычно упоминается как вставка следующей строки для удаления заголовка expect: 100 в запросе cURL
К сожалению, решение кажется мне неуловимым:
$headers = getallheaders(); $headers_new = ""; foreach($headers as $title => $body) { $headers_new[] = $title.": ".$body; } //$headers_new[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $headers_new); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:') );
Этот код работает, но удаляет все остальные заголовки (что не работает для меня, поскольку я использую HTTP-заголовки auth для аутентификации с помощью API). Вы также можете заметить, что я пытался добавить Expect: к существующим заголовкам, но это тоже не помогло.
Как я могу поддерживать существующие заголовки, но также препятствовать тому, чтобы cURL ожидал, что 100 продолжатся?
Использование $headers_new[] = 'Expect:'; работает, если массив $headers_new содержит строку, которая 'Expect: 100-continue' . В этом случае вам нужно удалить его из массива, иначе он будет ожидать, что 100 продолжит (логически).
Потому что в вашем коде вы используете getallheaders() и вы не проверяете, содержит ли он заголовок Expect: 100-continue так что это, вероятно, имеет место в вашем случае.
Вот сводка общей ситуации (и скрипта, который ее создал):
PHP Curl HTTP/1.1 100 Continue and CURLOPT_HTTPHEADER GET request ..........................................: Continue: No GET request with empty header ........................: Continue: No POST request with empty header .......................: Continue: Yes POST request with expect continue explicitly set .....: Continue: Yes POST request with expect (set to nothing) as well ....: Continue: Yes POST request with expect continue from earlier removed: Continue: No
Код:
<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch);с<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch);
Спасибо за сценарий, Хакре. Поскольку мне это нужно для HTTP PUT, я немного расширил его следующими результатами:
GET request ..........................................: Continue: No GET request with empty header ........................: Continue: No POST request with empty header .......................: Continue: Yes POST request with expect continue explicitly set .....: Continue: Yes POST request with expect (set to nothing) as well ....: Continue: Yes POST request with expect continue from earlier removed: Continue: No PUT request with empty header ........................: Continue: Yes PUT request with expect continue explicitly set ......: Continue: Yes PUT request with expect (set to nothing) as well .....: Continue: Yes PUT request with expect continue from earlier removed : Continue: No DELETE request with empty header .....................: Continue: Yes DELETE request with expect continue explicitly set ...: Continue: Yes DELETE request with expect (set to nothing) as well ..: Continue: Yes DELETE request with expect continue from earlier removed : Continue: No
Вот сценарий:
<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } // --- GET echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); // --- POST curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch); // --- PUT curl_setopt($ch, CURLOPT_PUT, TRUE); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with empty header ........................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue explicitly set ......: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect (set to nothing) as well .....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue from earlier removed : ", !curl_exec_continue($ch); // --- DELETE curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE"); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with empty header .....................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue explicitly set ...: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect (set to nothing) as well ..: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue from earlier removed : ", !curl_exec_continue($ch); ?>с<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } // --- GET echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); // --- POST curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch); // --- PUT curl_setopt($ch, CURLOPT_PUT, TRUE); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with empty header ........................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue explicitly set ......: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect (set to nothing) as well .....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue from earlier removed : ", !curl_exec_continue($ch); // --- DELETE curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE"); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with empty header .....................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue explicitly set ...: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect (set to nothing) as well ..: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue from earlier removed : ", !curl_exec_continue($ch); ?>с<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } // --- GET echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); // --- POST curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch); // --- PUT curl_setopt($ch, CURLOPT_PUT, TRUE); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with empty header ........................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue explicitly set ......: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect (set to nothing) as well .....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue from earlier removed : ", !curl_exec_continue($ch); // --- DELETE curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE"); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with empty header .....................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue explicitly set ...: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect (set to nothing) as well ..: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue from earlier removed : ", !curl_exec_continue($ch); ?>с<?php $ch = curl_init('http://www.iana.org/domains/example/'); function curl_exec_continue($ch) { curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); $continue = 0 === strpos($result, "HTTP/1.1 100 Continue\x0d\x0a\x0d\x0a"); echo "Continue: ", $continue ? 'Yes' : 'No', "\n"; return $result; } // --- GET echo "GET request ..........................................: ", !curl_exec_continue($ch); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "GET request with empty header ........................: ", !curl_exec_continue($ch); // --- POST curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, array('hello')); echo "POST request with empty header .......................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue explicitly set .....: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect (set to nothing) as well ....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "POST request with expect continue from earlier removed: ", !curl_exec_continue($ch); // --- PUT curl_setopt($ch, CURLOPT_PUT, TRUE); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with empty header ........................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue explicitly set ......: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect (set to nothing) as well .....: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "PUT request with expect continue from earlier removed : ", !curl_exec_continue($ch); // --- DELETE curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE"); $header = array(); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with empty header .....................: ", !curl_exec_continue($ch); $header[] = 'Expect: 100-continue'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue explicitly set ...: ", !curl_exec_continue($ch); $header[] = 'Expect:'; curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect (set to nothing) as well ..: ", !curl_exec_continue($ch); unset($header[0]); curl_setopt($ch, CURLOPT_HTTPHEADER, $header); echo "DELETE request with expect continue from earlier removed : ", !curl_exec_continue($ch); ?>