WebSocket 握手期间出错：意外的响应代码：302

Posted 2023-02-22

【中文标题】WebSocket 握手期间出错：意外的响应代码：302

【英文标题】：Error during WebSocket handshake: Unexpected response code: 302

【发布时间】：2018-01-21 04:25:48

【问题描述】：

在将基于 REACT 的 WebSocket 客户端连接到基于 Java Jetty 的 Web Socket 服务器时，我收到以下错误 -

WebSocket connection to 'ws://localhost:2319/ws' failed: Error during WebSocket handshake: Unexpected response code: 302

通过 Chrome 的 Smart Web Socket 客户端连接时不存在此错误。

我正在尝试开发基于 REACT 的 Web Socket Client。客户端代码是 -

var connection = new WebSocket('ws://localhost:2319/ws');
     connection.onopen = function () 
     // connection is opened and ready to use
    ;

WebSocket Server 一直基于 Jetty。服务器代码是 -

server = new Server();
    ServerConnector connector = new ServerConnector(server);
    connector.setPort(SSConstants.WWBSOCKET_PORT);
    server.addConnector(connector);

    // Setup the basic application "context" for this application at "/"
    // This is also known as the handler tree (in jetty speak)
    ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
    context.setContextPath("/ws"); // Set to "/ws" for future integration with the main jetty server.
    server.setHandler(context);

    try 
        // Initialize javax.websocket layer
        ServerContainer wsContainer = WebSocketServerContainerInitializer.configureContext(context);

        // Add WebSocket endpoint to javax.websocket layer
        wsContainer.addEndpoint(WebsocketListener.class);
        server.start();           
    
    catch (Throwable t) 
        ssLogger.logInfo("Websocket Server start exp : ");
        t.printStackTrace(System.err);
    

输出 -

WebSocket connection to 'ws://localhost:2319/ws' failed: Error during WebSocket handshake: Unexpected response code: 302

Request URL:ws://localhost:2319/ws
Request Method:GET
Status Code:302 Found

Response Headers
view source
Content-Length:0
Date:Fri, 11 Aug 2017 18:51:42 GMT
Location:http://localhost:2319/ws/
Server:Jetty(9.3.8.v20160314)

Request Headers
view source
Accept-Encoding:gzip, deflate, br
Accept-Language:en-US,en;q=0.8
Cache-Control:no-cache
Connection:Upgrade
Host:localhost:2319
Origin:https://localhost:1338
Pragma:no-cache
Sec-WebSocket-Extensions:permessage-deflate; client_max_window_bits
Sec-WebSocket-Key:2OZooIjOX7G6kgNpPOz9Fw==
Sec-WebSocket-Version:13
Upgrade:websocket
User-Agent:Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/60.0.3112.90 Safari/537.36
Name

【参考方案1】：

ws://localhost:2319/ws 不是有效的端点 URL/URI，它希望重定向到您声明的 contextPath 或 /ws 的正确端点

这就是 302 重定向告诉你的...

Location: http://localhost:2319/ws/

假设您的WebsocketListener 被声明为@ServerEndpoint("/ws")，我们在contextPath 或"/ws" 中使用您的ServletContext，这意味着您访问该websocket 端点的URL/URI 是...

ws://localhost:2319/ws/ws

或者换个说法……

ws://<host>:<port>/<contextPath>/<endpointPath>

【参考方案2】：

我最近遇到了同样的问题，这就是我能够解决我的问题的方法。

我将 websocket 服务器的端口号从 8080 更改为 8335，这与我的 Apache 服务器的端口号相同。

<?php
use Ratchet\Server\ioserver;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;
use MyApp\Chat;

require dirname(__DIR__) . '/vendor/autoload.php';

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new Chat()
        )
    ),
    8335
);

$server->run();

并且还在我的 javascript 代码中对实际连接进行了相同的更改

let conn = new WebSocket('ws://localhost:8335');
conn.onopen = function(e) 
    console.log("Connection established!");

    conn.send('Hello Everyone');
;

conn.onmessage = function(e) 
    console.log(e.data);
    $("#msg").append('<br>'+e.data);
;

您还可以按照下图在 Apache 控制器中查找空闲端口。谢谢

click on Netstart on the Xampp Controller

在此处输入图片说明

Click to refresh to view Active Socket, New Sockets and Old Sockets

Select any of the ports that falls in the burgundy section

谢谢