POCO websocket 异常答案

【问题标题】：POCO websocket exceptionPOCO websocket 异常
【发布时间】：2019-04-29 07:45:23
【问题描述】：

我需要在 C++ 服务器和 Angular 客户端之间创建 WebSocket 通信。我使用了 POCO 库和 websocket 服务器 示例。我设法在服务器和客户端之间交换数据。

我的问题是当我更新网页（F5）时，服务器关闭了。

我应该处理什么异常？

class WebSocketRequestHandler : public HTTPRequestHandler
    /// Handle a WebSocket connection.
{
public:
    void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
    {
        Application& app = Application::instance();
        try
        {
            WebSocket ws(request, response);
            app.logger().information("WebSocket connection established.");
            char buffer[1024];

        do
        {

        n = ws.receiveFrame(buffer, sizeof(buffer), flags); 

            cout << buffer << endl;

        } while (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE);

        app.logger().information("WebSocket connection closed.");

    }
    catch (WebSocketException& exc)
    {
        app.logger().log(exc);
        switch (exc.code())
        {
        case WebSocket::WS_ERR_HANDSHAKE_UNSUPPORTED_VERSION:
            response.set("Sec-WebSocket-Version", WebSocket::WEBSOCKET_VERSION);

        case WebSocket::WS_ERR_NO_HANDSHAKE:

        case WebSocket::WS_ERR_HANDSHAKE_NO_VERSION:

        case WebSocket::WS_ERR_HANDSHAKE_NO_KEY:

        response.setStatusAndReason(HTTPResponse::HTTP_BAD_REQUEST);
        response.setContentLength(0);
        response.send();
        break; 
        }
    }
    }
};

【问题讨论】：

标签： c++ websocket poco-libraries

【解决方案1】：

我还在我的应用程序中捕获了Poco::Exception。它运行良好，没有崩溃：

catch (WebSocketException& exception)
{
    switch (exception.code())
    {
    case WebSocket::WS_ERR_HANDSHAKE_UNSUPPORTED_VERSION:
        response.set("Sec-WebSocket-Version", WebSocket::WEBSOCKET_VERSION);
        // No break, fall through
    case WebSocket::WS_ERR_NO_HANDSHAKE:
    case WebSocket::WS_ERR_HANDSHAKE_NO_VERSION:
    case WebSocket::WS_ERR_HANDSHAKE_NO_KEY:
        response.setStatusAndReason(HTTPResponse::HTTP_BAD_REQUEST);
        response.setContentLength(0);
        response.send();
        break;
    }
}
catch (Poco::Exception& exception)
{
    _logger.error("[%s] handle request {%s}", caller(), exception.displayText());
}

【讨论】：