无法通过 Express-WS 中间件正确创建 WebSocket 服务器

Question

我正在使用node.js和express编写一个websocket服务器，我使用express-ws中间件来帮助我。但是客户端无法连接服务器。下面是我的代码。

app.js:

var app = express();
var expressWs = require("express-ws")(app);
...
var webso = require("./routes/ws");
app.use("/chat",webso);

路线/js:

var express = require('express');
var router = express.Router();
router.ws("/",function(ws,req){
  console.log("socket from client")
  ws.on('message',function(msg){
    ws.send('back from node');
  })
});
module.exports=router;

客户端:

wx.connectSocket({
        url:"ws://localhost:3000/chat",
        success(){
            console.log("success")
        },
        fail(){
            console.log("err")
        },
        complete(){
            console.log("done");
        }
    });

客户端无法连接websocket服务器:

asdebug.js:1 WebSocket connection to 'ws://localhost:3000/chat' failed: Connection closed before receiving a handshake response

我想我在快递服务上做错了什么。我需要你的帮助。

Answer 1

您是否在app.js中做app.listen(3000)以打开该端口?Websockets只是HTTP(s)的升级，这样你就可以在与其他路由相同的端口上运行。

你的服务器端代码看起来很好，但不确定客户端。这工作得很好，当打开时输出'socket from client':

app.js

var express = require('express');
var app = express();
var expressWs = require("express-ws")(app);
var webso = require("./ws.js");
app.use("/chat",webso);
app.listen(3000);

js

var express = require('express');
var router = express.Router();
router.ws("/",function(ws,req){
  console.log("socket from client")
  ws.on('message',function(msg){
    ws.send('back from node');
  })
});
module.exports=router;

test.htm

<script type="text/javascript">
    websocket = new WebSocket('ws://localhost:3000/chat');
</script>