nodejs 如何使用upgrade，並且C/B 發送訊息

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 1 const http = require(‘http‘); 2 const querystring = require("querystring"); 3 var postData = querystring.stringify({ 4     ‘msg‘: ‘Hello World!‘ 5 }); 6 // Create an HTTP server 7 var srv = http.createServer((req, res) => { 8     res.writeHead(200, {‘Content-Type‘: ‘text/plain‘}); 9     res.end(‘okay‘);10 });11 srv.on(‘upgrade‘, (req, socket, head) => {12 13     socket.write(‘HTTP/1.1 101 Web Socket Protocol Handshake\r\n‘ +14         ‘Upgrade: WebSocket\r\n‘ +15         ‘Connection: Upgrade\r\n‘ +16         ‘\r\n‘);17 18     socket.on("data", (d)=> {19         console.log(d.toString())20     });21     socket.on("end", ()=> {22         socket.write("發送伺服器的訊息");23         socket.end();24         if (!socket.destroyed) {25             console.log(" socket.end 會銷毀socket,不信你可以執行end，看會不會進入這個方法")26             if (socket.destroy) {27                 socket.destroy();28                 console.log(!socket.destroyed)29             }30 31         }32     });33 });34 35 // now that server is running36 srv.listen(1337, ‘127.0.0.1‘, () => {37 38     // make a request39     var options = {40         port: 1337,41         hostname: ‘127.0.0.1‘,42         headers: {43             ‘Connection‘: ‘Upgrade‘,44             ‘Upgrade‘: ‘websocket‘45         }46     };47 48     var req = http.request(options);49     req.on(‘upgrade‘, (res, socket, upgradeHead) => {50         socket.write(‘發送用戶端的訊息\r\n‘);51         socket.end();52 53         socket.on(‘data‘, (chunk) => {54             console.log(chunk.toString());55         });56         socket.on(‘end‘, () => {57             console.log("伺服器訊息接收完畢");58             console.log("socket已經被銷毀",socket.destroyed)59         });60 61     });62 63     req.end();64 65 66 });

整個流程是

  1 ：request的 header裡加上:

 ‘Connection‘: ‘Upgrade‘, ‘Upgrade‘: ‘websocket‘

產生的http.ClientRequest 最後一定要調用end函數，不然伺服器會一直等待你訊息發送完畢

2: 伺服器監聽 ‘Upgrade’，然後返回：

‘HTTP/1.1 101 Web Socket Protocol Handshake\r\n‘ +    ‘Upgrade: WebSocket\r\n‘ +    ‘Connection: Upgrade\r\n‘ +   ‘\r\n‘


維基百科裡說了，這樣叫作握手！

 

這樣的話，Upgrade 就算建立起來了。

3:然後就可以通過socket相互訊息了。記住socket.end一旦執行，就會斷開這次的tcp連結了。

 

nodejs 如何使用upgrade，並且C/B 發送訊息