How can PHP be configured to tunnel socket connections through an HTTP proxy to access a web server on port 80?

To tunnel socket connections through an HTTP proxy to access a web server on port 80 in PHP, you can use the cURL library with the CURLOPT_PROXY option set to the proxy server address. This will allow you to make HTTP requests through the proxy server. Below is a PHP code snippet demonstrating how to configure cURL to tunnel socket connections through an HTTP proxy: 

$proxy = 'http://proxyserver:port';
$url = 'http://webserver:80';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

if ($response === false) {
    echo 'Error: ' . curl_error($ch);
} else {
    echo $response;
}

curl_close($ch);

Keywords

PHP socket connections HTTP proxy tunneling web server

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