cinatra::http_server* cinatra_web_server_;
    cinatra_web_server_->set_transfer_type(transfer_type::ACCEPT_RANGES);

    struct cross_origin
    {
        bool before(request &req, response &rep)
        {
            rep.add_header("Access-Control-Allow-Origin", "*");
            rep.add_header("Access-Control-Allow-Credentials", "true");
            if (req.get_method() == cinatra::method_name(cinatra::OPTIONS))
            {
                rep.add_header("Access-Control-Allow-Methods", "POST,GET,OPTIONS");
                rep.add_header("Access-Control-Allow-Headers", "Content-Type,Origin,Accept");
                rep.add_header("Access-Control-Max-Age", "120");
                rep.set_status_and_content(cinatra::status_type::ok);
                return false;
            }
            return true;
        }
    };
    cinatra_web_server_->set_http_handler<http_method::GET, http_method::POST, http_method::OPTIONS>("/hello", 
        [this](request& req, response& rep) { rep.set_status_and_content(status_type::ok); }, cross_origin{});