public static function send($rq)
    {
        if (self::$_curlHandler) {
            if (function_exists('curl_reset')) {
                curl_reset(self::$_curlHandler);
            } else {
                my_curl_reset(self::$_curlHandler);
            }
        } else {
            self::$_curlHandler = curl_init();
        }
        curl_setopt(self::$_curlHandler, CURLOPT_URL, $rq['url']);
        switch (true) {
            case isset($rq['method']) && in_array(strtolower($rq['method']), ['get', 'post', 'put', 'delete', 'head']):
                $method = strtoupper($rq['method']);
                break;
            case isset($rq['data']):
                $method = 'POST';
                break;
            default:
                $method = 'GET';
        }
        $header = isset($rq['header']) ? $rq['header'] : [];
        $header[] = 'Method:'.$method;
        $header[] = 'User-Agent:'.Conf::getUA();
        $header[] = 'Connection: keep-alive';
        if ('POST' == $method) {
            $header[] = 'Expect: ';
        }

        isset($rq['host']) && $header[] = 'Host:'.$rq['host'];
        curl_setopt(self::$_curlHandler, CURLOPT_HTTPHEADER, $header);
        curl_setopt(self::$_curlHandler, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt(self::$_curlHandler, CURLOPT_CUSTOMREQUEST, $method);
        isset($rq['timeout']) && curl_setopt(self::$_curlHandler, CURLOPT_TIMEOUT, $rq['timeout']);
        isset($rq['data']) && in_array($method, ['POST', 'PUT']) && curl_setopt(self::$_curlHandler, CURLOPT_POSTFIELDS, $rq['data']);
        $ssl = substr($rq['url'], 0, 8) == 'https://' ? true : false;
        if (isset($rq['cert'])) {
            curl_setopt(self::$_curlHandler, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt(self::$_curlHandler, CURLOPT_CAINFO, $rq['cert']);
            curl_setopt(self::$_curlHandler, CURLOPT_SSL_VERIFYHOST, 2);
            self::setCurlSSLVersion($rq);
        } elseif ($ssl) {
            curl_setopt(self::$_curlHandler, CURLOPT_SSL_VERIFYPEER, false); //true any ca
            curl_setopt(self::$_curlHandler, CURLOPT_SSL_VERIFYHOST, 0); //not check the names
            self::setCurlSSLVersion($rq);
        }
        $ret = curl_exec(self::$_curlHandler);
        self::$_httpInfo = curl_getinfo(self::$_curlHandler);

        return $ret;
    }