curl超时小于1000ms总是失败？ [英] curl timeout less than 1000ms always fails?

问题描述

此代码总是失败（即 $ result 是布尔 false ）：

This code always fails (i.e., $result is Boolean false):

     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $path);
     curl_setopt($ch, CURLOPT_HEADER, TRUE);
     curl_setopt($ch, CURLOPT_NOBODY, TRUE);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
     $curl_version = curl_version();

     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT_MS, 999);

     $result = curl_exec($ch);
     curl_close($ch);

此代码总是成功的（即 $ result 是包含标题的字符串）：

This code always succeeds (i.e., $result is a string containing the header):

     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $path);
     curl_setopt($ch, CURLOPT_HEADER, TRUE);
     curl_setopt($ch, CURLOPT_NOBODY, TRUE);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
     $curl_version = curl_version();

     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT_MS, 1000);

     $result = curl_exec($ch);
     curl_close($ch);

唯一的区别是我已将超时从999ms更改为1000ms。

The only difference is that I've changed the timeout from 999ms to 1000ms.

这是我错过的连接超时的文档中的curl或某种最低限度的错误。这是什么？我的钱是后者。

This must be either a bug in curl or some sort of minimum in the documentation for connection timeouts that I missed. Which is it? My money is on the latter.

推荐答案

来自： http://www.php.net/manual/en/function.curl-setopt.php

尝试连接时等待的毫秒数。使用0无限期等待。 如果libcurl构建为使用标准系统名称解析器，则该部分的连接仍将使用全秒分辨率超时，允许最少超时一秒。

这篇关于curl超时小于1000ms总是失败？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！