卷曲超时小于1000ms总是失败？
此代码始终失败（即 $result 是布尔值 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);
此代码始终成功（即 $result 是包含标头的字符串)：
$ch = curl_init();
curl_setopt($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);
唯一的区别是我将超时从 999 毫秒更改为 1000 毫秒。
这肯定是curl 中的一个错误，或者是我错过的连接超时文档中的某种最小值。是哪一个？我的钱花在后者上。
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);
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);
The only difference is that I've changed the timeout from 999ms to 1000ms.
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.
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来自： http://www.php.net/manual/en/function .curl-setopt.php
from: http://www.php.net/manual/en/function.curl-setopt.php
处理此问题的另一种方法是，除了
CURLOPT_CONNECTTIMEOUT_MS之外，还将CURLOPT_NOSIGNAL选项设置为 1。请参阅http://curl.haxx.se/libcurl/c/CURLOPT_NOSIGNAL.html 了解更多信息。Another way of dealing with this would be to set the
CURLOPT_NOSIGNALoption to 1 in addition to theCURLOPT_CONNECTTIMEOUT_MS. See http://curl.haxx.se/libcurl/c/CURLOPT_NOSIGNAL.html for more info.