Php cURL:操作在0毫秒后超时

cURL给了我一个错误：

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

特别是，“0毫秒”部分是可疑的

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);

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超时似乎设置正确，可能与此有关吗？

我在尝试通过https连接时也遇到了同样的问题。问题在于ssl版本。 这对我来说很有效：

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

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如果不提供超时怎么办？禁用主机验证很难闻！和已经使用的TS

curl\u setopt（$curl，CURLOPT\u SSLVERSION，3）