apache 서버로 접속시 다른 머신의 웹서버로 redirect?

function printe ($err) {
    echo "<script type=\"text/javascript\">\n" .
         "  alert('$err')\n" .
         "  history.back();\n" .
         "</script>\n";
 
    exit;
}
 
if ( ! extension_loaded ('curl') ) :
     printe ("Not loaded Curl Extension");
endif;
 
$uri = $_SERVER['QUERY_STRING'];
$uri = $uri ? "?${uri}" : '';
$method = $_SERVER['REQUEST_METHOD'];
 
$_server = "http://css-validator.kldp.org:8080/{$uri}";
 
$_lang = ( ! $_GET['_lang'] ) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : $_GET['_lang'];
#$_lang = 'ko';
 
$c = curl_init ();
 
curl_setopt ($c, CURLOPT_URL, $_server);
curl_setopt ($c, CURLOPT_TIMEOUT, 60);
curl_setopt ($c, CURLOPT_NOPROGRESS, 1);
curl_setopt ($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($c, CURLOPT_USERAGENT, "CSS-Validator KLDP Wrapper 1.0");
curl_setopt ($c, CURLOPT_AUTOREFERER, 1);
curl_setopt ($c, CURLOPT_FOLLOWLOCATION, 1);
 
$header[] = "Host: css-validator.kldp.org";
if ( $_lang )
  $header[] = "Accept-Language: {$_lang}";
$header[] = 'Expect:';
 
curl_setopt ($c, CURLOPT_HEADER, 0);
curl_setopt ($c, CURLOPT_NOBODY, 0);
curl_setopt ($c, CURLOPT_HTTPHEADER, $header);
curl_setopt ($c, CURL_FAILONERROR, 1);
 
if ( $method == 'POST' ) :
    $_post = array ();
 
    if ( is_array ($_FILES['file']) ) :
        $_post['file'] = "@{$_FILES['file']['tmp_name']}";
    endif;
 
    $_post = array_merge ($_post, $_POST);
 
    curl_setopt ($c, CURLOPT_POST, 1);
    curl_setopt ($c, CURLOPT_POSTFIELDS, $_post);
endif;
 
$data = curl_exec($c);
 
if ( empty ($data) ) :
  printe (curl_error($c));
endif;
curl_close ($c);
 
$data = preg_replace ("!(</html>).*!s", '\\1', $data);
echo trim ($data) ."\n";
?>