yii\httpclient\Request::createFullUrl PHP Method

    private function createFullUrl($url)
    {
        if (is_array($url)) {
            $params = $url;
            if (isset($params[0])) {
                $url = $params[0];
                unset($params[0]);
            }
            if (!empty($params)) {
                if (strpos($url, '?') === false) {
                    $url .= '?';
                } else {
                    $url .= '&';
                }
                $url .= http_build_query($params);
            }
        }
        if (!empty($this->client->baseUrl)) {
            if (!preg_match('/^https?:\\/\\//i', $url)) {
                $url = $this->client->baseUrl . '/' . $url;
            }
        }
        return $url;
    }