如何提前关闭连接? [英] How do I close a connection early?

问题描述

我正在尝试执行一个 AJAX 调用(通过 JQuery)，这将启动一个相当长的过程.我希望脚本简单地发送一个响应，表明进程已经开始，但在 PHP 脚本运行完成之前，JQuery 不会返回响应.

我已经尝试过使用关闭"标题(如下)以及输出缓冲；两者似乎都不起作用.有什么猜测吗?或者这是我需要在 JQuery 中做的事情?

解决方案

以下 PHP 手册页(包括用户注释)建议了有关如何在不结束 PHP 脚本的情况下关闭与浏览器的 TCP 连接的多个说明:

>

• 连接处理^文档

据说它需要的不仅仅是发送一个关闭标头.

<小时>

OP 然后确认:是的，这成功了: 指向用户注释 #71172(2006 年 11 月) 复制到此处:

<块引用>

关闭用户浏览器连接同时保持你的 php 脚本运行一直是一个问题，因为 [PHP] 4.1，当 register_shutdown_function() 的行为被修改时，它不会自动关闭用户连接.

sts at mail dot xubion dot hu 贴出原解:

在您将 phpinfo() 替换为 echo('text I want user to see'); 之前，它可以正常工作，在这种情况下，永远不会发送标头！>

解决方案是在发送标头信息之前明确关闭输出缓冲并清除缓冲区.示例:

刚刚花了 3 个小时试图解决这个问题，希望它可以帮助某人 :)

测试:

• IE 7.5730.11
• Mozilla Firefox 1.81

<小时>

稍后在 2010 年 7 月的相关答案 Arctic Fire 然后将另外两个用户注释链接到上述注释:

• 连接处理用户注释 #89177(2009 年 2 月)
• 连接处理用户注意事项 #93441(2009 年 9 月)

I'm attempting to do an AJAX call (via JQuery) that will initiate a fairly long process. I'd like the script to simply send a response indicating that the process has started, but JQuery won't return the response until the PHP script is done running.

I've tried this with a "close" header (below), and also with output buffering; neither seems to work. Any guesses? or is this something I need to do in JQuery?

<?php

echo( "We'll email you as soon as this is done." );

header( "Connection: Close" );

// do some stuff that will take a while

mail( '[e-mail]', "okay I'm done", 'Yup, all done.' );

?>

解决方案

The following PHP manual page (incl. user-notes) suggests multiple instructions on how to close the TCP connection to the browser without ending the PHP script:

• Connection handling ^Docs

Supposedly it requires a bit more than sending a close header.

---

OP then confirms: yup, this did the trick: pointing to user-note #71172 (Nov 2006) copied here:

Closing the users browser connection whilst keeping your php script running has been an issue since [PHP] 4.1, when the behaviour of register_shutdown_function() was modified so that it would not automatically close the users connection.

sts at mail dot xubion dot hu Posted the original solution:

<?php
header("Connection: close");
ob_start();
phpinfo();
$size = ob_get_length();
header("Content-Length: $size");
ob_end_flush();
flush();
sleep(13);
error_log("do something in the background");
?>

Which works fine until you substitute phpinfo() for echo('text I want user to see'); in which case the headers are never sent!

The solution is to explicitly turn off output buffering and clear the buffer prior to sending your header information. Example:

<?php
ob_end_clean();
header("Connection: close");
ignore_user_abort(true); // just to be safe
ob_start();
echo('Text the user will see');
$size = ob_get_length();
header("Content-Length: $size");
ob_end_flush(); // Strange behaviour, will not work
flush(); // Unless both are called !
// Do processing here 
sleep(30);
echo('Text user will never see');
?>

Just spent 3 hours trying to figure this one out, hope it helps someone :)

Tested in:

• IE 7.5730.11
• Mozilla Firefox 1.81

---

Later on in July 2010 in a related answer Arctic Fire then linked two further user-notes that were-follow-ups to the one above:

• Connection Handling user-note #89177 (Feb 2009)
• Connection Handling user-note #93441 (Sep 2009)

这篇关于如何提前关闭连接?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！