PHP HTTP POST失败，当cURL数据> 1024 [英] PHP HTTP POST fails when cURL data > 1024

问题描述

注意：结束处的解决方案

如果我尝试执行超过1024个字符的HTTP POST，为什么？以下是一个最小示例：

If I attempt to do a HTTP POST of over 1024 characters, it fails. Why? Here is a minimal example:

recipient.php：

recipient.php:

<?php
if (strlen(file_get_contents('php://input')) > 1000
    || strlen($HTTP_RAW_POST_DATA) > 1000) {
 echo "This was a triumph.";
}
?>

sender.php：

sender.php:

<?php
function try_to_post($char_count) {
 $url = 'http://gpx3quaa.joyent.us/test/recipient.php';
 $post_data = str_repeat('x', $char_count);
 $c = curl_init();
 curl_setopt_array($c,
                    array(  CURLOPT_URL => $url,
                            CURLOPT_HEADER => false,
                            CURLOPT_CONNECTTIMEOUT => 999,
                            CURLOPT_RETURNTRANSFER => true,
                            CURLOPT_POST => 1,
                            CURLOPT_POSTFIELDS => $post_data
                    )
 );
 $result = curl_exec($c);
 echo "{$result}\n";
 curl_close($c);
}

for ($i=1020;$i<1030;$i++) {
 echo "Trying {$i} - ";
 try_to_post($i);
}
?>

输出：

Trying 1020 - This was a triumph.
Trying 1021 - This was a triumph.
Trying 1022 - This was a triumph.
Trying 1023 - This was a triumph.
Trying 1024 - This was a triumph.
Trying 1025 - 
Trying 1026 - 
Trying 1027 - 
Trying 1028 - 
Trying 1029 - 

配置：

PHP Version 5.2.6
libcurl/7.18.0 OpenSSL/0.9.8g zlib/1.2.3 libidn/1.8
lighttpd-1.4.19

解决方案

为cURL添加以下选项：

Add the following option for cURL:

curl_setopt($ch,CURLOPT_HTTPHEADER,array("Expect:"));

原因似乎是任何超过1024字符的POST导致Expect：100-continueHTTP标题发送，Lighttpd 1.4。*不支持。我找到了一张票： http://redmine.lighttpd.net/issues/show/1017

The reason seems to be that any POST over 1024 character causes the "Expect: 100-continue" HTTP header to be sent, and Lighttpd 1.4.* does not support it. I found a ticket for it: http://redmine.lighttpd.net/issues/show/1017

他们说它在1.5版本中有效。

They say it works in 1.5.

推荐答案

你可以说服PHP的curl后端通过设置一个明确的请求头来停止做100继续：

You can convince PHP's curl backend to stop doing the 100-continue-thing by setting an explicit request header:

curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));

这样你可以发布一个请求，不论你想要什么，curl不会做双阶段post。

This way you can post a request however long you would ever want and curl will not do the dual phase post.

我有近两年前发布了这篇文章。

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