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Using curl to Query Remote Servers

Curl and proxies

As with all other full featured browsers curl has support for proxies. Proxy servers are buffers between the requesting client and the web server. Proxy servers are used for a variety of reasons including companies restricting web access to people wanting to appear anonymous.

There are a few curl options to set when using a proxy. First to enable use of a proxy in curl use the option CURLOPT_HTTPPROXYTUNNEL. Second set the proxy with the option CURLOPT_PROXY. If you need to set authentication information use the option CURLOPT_PROXYUSERPWD. CURLOPT_PROXYUSERPWD expects a string in the format of user:password. HTTP proxies are default, to use a SOCKS proxy use the CURLOPT_PROXYTYPE option.

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, '');
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, '');
curl_setopt($ch, CURLOPT_PROXYUSERPWD, 'user:password');
$data = curl_exec();
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