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reCAPTCHA Could not open socket (Behind a proxy)

Recaptcha provides a php library for integration into web applications. Unfortunately, it depends on the web server having full outgoing access to the internet. In a situation where you are forcing outgoing connections to go via proxy,  the following modifications should work.

The new _recaptcha_http_post() function:

 * Submits an HTTP POST to a reCAPTCHA server
 * @param string $host
 * @param string $path
 * @param array $data
 * @param int port
 * @return array response
function _recaptcha_http_post($host, $path, $data, $port = 80) {

        $proxy_host = '@@YOUR_WEB_PROXY_HERE';

        $req = _recaptcha_qsencode ($data);

        $http_request  = "POST http://$host$path HTTP/1.0\r\n";
        $http_request .= "Host: $host\r\n";
        $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
        $http_request .= "Content-Length: " . strlen($req) . "\r\n";
        $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
        $http_request .= "\r\n";
        $http_request .= $req;

        $response = '';
        if( false == ( $fs = @fsockopen($proxy_host, $proxy_port, $errno, $errstr, 10) ) ) {
                die ('Could not open socket');

        fwrite($fs, $http_request);

        while ( !feof($fs) )
                $response .= fgets($fs, 1160); // One TCP-IP packet
        $response = explode("\r\n\r\n", $response, 2);

        return $response;
You can find the modified code here recaptchalib.php
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