public static function http($method, $uri, array $post_data = array(), array $headers = array()) {

    $m = strtoupper($method);
    $u = array_merge(array('path' => '/', 'port' => '80'), parse_url($uri));
    $h = array('host' => $u['host'], 'connection' => 'close');

    if ($m == 'POST') {
        $h += array('content-type' => 'application/x-www-form-urlencoded');
    }

    $h += $headers;

    if (($sock = fsockopen($u['host'], $u['port']))) {

        fputs($sock, $m . ' ' . $u['path'] . ' HTTP/1.1' . "\r\n");

        foreach ($h as $f => $v) {
            fputs($sock, $f . ': ' . $v . "\r\n");
        }

        fputs($sock, "\r\n");

        if ($post_data) {
            fputs($sock, http_build_query($post_data));
        }

        $data = '';
        while (!feof($sock)) {
            $data .= fgets($sock, 4096);
        }

        return implode('', array_slice(explode("\r\n\r\n", $data), 1));
    }
}