cURL：操作在 0 毫秒后超时

Question

cURL 给了我错误：

Operation timed out after 0 milliseconds with 0 out of 0 bytes received

尤其是“0毫秒”部分很可疑……

我的初始化代码：

$curl = curl_init($requestUrl); // private URL not published
curl_setopt($curl, CURLOPT_FRESH_CONNECT, true);
curl_setopt($curl, CURLINFO_HEADER_OUT, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_HTTPHEADER, 
  array("Content-Type: application/xml", "Accept: application/xml"));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 20);
curl_setopt($curl, CURLOPT_FAILONERROR, false);
curl_setopt($curl, CURLOPT_HTTP200ALIASES, range(400, 599));
curl_setopt($curl, CURLOPT_SSLVERSION, 3);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);

超时似乎设置正确，可能与它有关吗？

Answer 1

我在尝试通过 https 连接时遇到了同样的问题。问题出在 ssl 版本上。 这对我来说效果很好：

$ch=curl_init();
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSLVERSION, 3);