来自服务器[200]的HTTP响应不允许HTTP升级到WebSocket

Question

我的Websocket客户端是使用STOMP Java客户端（Spring项目）开发的，而服务器是通过Spring启动实现的。

客户端/服务器握手发生时，出现连接升级问题。

Java客户端代码

List<Transport> transports = new ArrayList<>(1);
transports.add(new WebSocketTransport(new StandardWebSocketClient()));      

SockJsClient sockjsClient = new SockJsClient(transports);   

WebSocketStompClient stompClient = new WebSocketStompClient(sockjsClient);

stompClient.setMessageConverter(new MappingJackson2MessageConverter());

stompClient.setTaskScheduler(new ConcurrentTaskScheduler());

StompSessionHandler sessionHandler = new SessionHandler();
stompClient.connect("ws://localhost:9090/health", sessionHandler);

服务器端

@Override
public void registerStompEndpoints(StompEndpointRegistry stompEndpointRegistry) {       
    stompEndpointRegistry.addEndpoint("/health")
            .setAllowedOrigins("*")
            .withSockJS();
}
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.enableSimpleBroker("/topic");
    registry.setApplicationDestinationPrefixes("/app");
}

与服务器连接时在客户端生成的异常

16:18:50.955/3771 [SimpleAsyncTaskExecutor-1] ERROR o.s.w.s.s.c.DefaultTransportRequest - No more fallback transports after TransportRequest[url=ws://localhost:9090/health/29/344d627baac949f5bab5506f05f1a7eb/websocket]
javax.websocket.DeploymentException: The HTTP response from the server [200] did not permit the HTTP upgrade to WebSocket
               at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServerRecursive(WsWebSocketContainer.java:434)
               at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServerRecursive(WsWebSocketContainer.java:392)
               at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWebSocketContainer.java:194)
               at org.springframework.web.socket.client.standard.StandardWebSocketClient.lambda$doHandshakeInternal$0(StandardWebSocketClient.java:150)
               at java.util.concurrent.FutureTask.run(FutureTask.java:266)
               at java.lang.Thread.run(Thread.java:745)

在tomcat localhost_access_log中，我看到以下请求信息

127.0.0.1 - - [01/Nov/2018:22:09:41 +0530] "GET /health/info HTTP/1.1" 302 - 0
127.0.0.1 - - [01/Nov/2018:22:09:41 +0530] "GET /login.jsp HTTP/1.1" 200 7649 16
127.0.0.1 - - [01/Nov/2018:22:09:41 +0530] "GET /health/191/6828a1fdefee40cf8dc74e825d8d2b0c/websocket HTTP/1.1" 302 - 0
127.0.0.1 - - [01/Nov/2018:22:09:41 +0530] "GET /login.jsp HTTP/1.1" 200 7649 0

我没有找到有关如何解决此问题以及造成此问题的原因的任何信息。

请帮助我解决此问题。

Answer 1

为时已晚，无法为您的问题提供有用的解决方案。今天，我面临着您已经遇到的同一问题。不幸的是，Spring Framework示例和官方资源并未完全引用。因此，我想写一下我的制作和运行方式。首先，原始答案不属于我。我在https://code5.cn/so/java/783097找到了它。

据我了解，为了能够从HTTP升级WebSocket协议，我们应该对“ WebSocketConfiguration”部分进行一些扩展，以提供所需的功能。

RequestUpgradeStrategy upgradeStrategy = new TomcatRequestUpgradeStrategy();
registry.addEndpoint("/hello")
        .withSockJS();

registry.addEndpoint("/hello")
        .setHandshakeHandler(new DefaultHandshakeHandler(upgradeStrategy))
        .setAllowedOrigins("*");

进行了上述调整后，您可以了解通过嗅探WireShark在协议之间进行切换的情况。

我希望这对寻求摆脱错误的人有所帮助。