POST/GET using a proxy server

Hi all- how do I modify the following function to work over a proxy server? Thanks for any help. David /* sendToHost * ~~~~~~~~~~ * Params: * $host - Just the hostname. No http:// or /path/to/file.html portions * $method - get or post, case-insensitive * $path - The /path/to/file.html part * $data - The query string, without initial question mark * $useragent - If true, 'MSIE' will be sent as the User-Agent (optional) * * Examples: * sendToHost('www.google.com','get','/search','q=php_imlib'); * sendToHost('www.example.com','post','/some_script.cgi', * 'param=First+Param&second=Second+param'); */ function sendToHost($host,$method,$path,$data,$useragent=0) { // Supply a default method of GET if the one passed was empty if (empty($method)) { $method = 'GET'; } $method = strtoupper($method); $fp = fsockopen($host, 80); if ($method == 'GET') { $path .= '?' . $data; } fputs($fp, "$method $path HTTP/1.1\r\n"); fputs($fp, "Host: $host\r\n"); if ($useragent) { fputs($fp, "User-Agent: MSIE\r\n"); } if ($method == 'POST') { fputs($fp,"Content-type: application/x-www-form-urlencoded\r\n"); fputs($fp, "Content-length: " . strlen($data) . "\r\n"); } fputs($fp, "Connection: close\r\n\r\n"); if ($method == 'POST') { fputs($fp, $data); } while (!feof($fp)) { $buf .= fgets($fp,128); } fclose($fp); return $buf; }