Method onError

performance/ws_echo_client.cpp:80–84

    }

    void onError(int error, const std::string& category, const std::string& message) override
    {
        std::cout << "WebSocket client caught an error with code " << error << " and category '" << category << "': " << message << std::endl;
        ++total_errors;
    }

private:
    size_t _sent{0};