cURL启动时间慢 [英] cURL slow starttransfer_time

问题描述

Good Day！

在请求页面时，cURL的运行速度非常慢。我知道不是请求的页面，因为该页面会立即在浏览器中返回。

cURL is acting very slow when requesting a page. I know its not the page requested, because the page returns in the browser instantly.

我注意到的两件事

• starttransfer_time通常为20


• local_port似乎每次都在变化。


• 偶尔，cURL会立即响应

我有以下代码：

$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $url ); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, false);
$output = curl_exec($ch); 
curl_close($ch); 

回显curl_getinfo（）给我以下内容

Echoing curl_getinfo() gives me the following

[url] => http://127.0.0.1:80/wpengine/?json=t
[content_type] => text/html; charset=iso-8859-1
[http_code] => 302
[header_size] => 215
[request_size] => 64
[filetime] => -1
[ssl_verify_result] => 0
[redirect_count] => 0
[total_time] => 17.238
[namelookup_time] => 0
[connect_time] => 0
[pretransfer_time] => 0
[size_upload] => 0
[size_download] => 221
[speed_download] => 12
[speed_upload] => 0
[download_content_length] => 221
[upload_content_length] => 0
[starttransfer_time] => 17.238
[redirect_time] => 0
[certinfo] => Array
    (
    )

[primary_ip] => 127.0.0.1
[primary_port] => 80
[local_ip] => 127.0.0.1
[local_port] => 51875
[redirect_url] => 

有人可以给我一些指示来弄清楚发生了什么吗？

Can anyone give me some pointers on how to figure out what is going on?

以下是Apache访问日志中的几行

Here are a few lines from the Apache access log

127.0.0.1 - - [06/Dec/2013:12:01:22 -0500] "GET /wpengine/?json=t HTTP/1.1" 302 221
127.0.0.1 - - [06/Dec/2013:12:01:12 -0500] "GET /community HTTP/1.1" 200 6266
127.0.0.1 - - [06/Dec/2013:12:01:22 -0500] "GET /public/js/jquery.js?b=10 HTTP/1.1" 304 -

推荐答案

这主要是因为期望：100连续标头中的CURL在处理大型POST数据时发送到服务器，而服务器恰巧不支持此功能。您可以通过为 curl 命令行添加 -vv 来确认并查看输出。

This is mostly because of the Expect: 100-continue header CURL send to the server when it handles large POST data, and the server just happened not support this feature. You can confirm by add -vv for curl command line and see the outputs.

要解决此问题，您可以

1. 修复服务器以支持预期：100 -continue 标头，或


2. 强制卷曲不通过添加 -H Expect： 发送选项（在php中，您可以参考以下答案：如何我停止使用100继续使用cURL吗？）。

1. fix your server to support Expect: 100-continue header, or
2. force curl not to send it by add -H "Expect:" option (in php, you can refer to this answer: How can I stop cURL from using 100 Continue?).

关于的链接预期：100-继续：

https://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.2.3
https://support.urbanairship.com/entries/59909909-期望100-继续-问题与风险

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