如何在PHP中创建代理

Question

我试图在PHP中创建代理。当我访问页面http://example.com时一切正常，但是使用cURL，我总是得到401 Unauthorized Error。

我的代码：

$ch = curl_init();
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_COOKIESESSION, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, getallheaders());
curl_setopt($ch, CURLOPT_URL, 'http://example.com');
print_r(curl_exec($ch));

回应：

HTTP/1.1 401 Unauthorized
Content-Type: text/html
Server: Microsoft-IIS/7.5
WWW-Authenticate: Negotiate
WWW-Authenticate: NTLM
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Date: Thu, 20 Oct 2016 01:30:11 GMT
Content-Length: 1293