错误[ERR_STREAM_WRITE_AFTER_END]：结束后写入[使用socket.io的npm请求]

Question

在我的服务器端，我监听套接字服务器，在我自己的笔记本电脑中，我具有socket.io-client服务，每当我打开它们时，它们都在连接。

当其他人向我的服务器请求时，服务器通过套接字将该请求发送到我的笔记本电脑，然后我的笔记本电脑使用npm-request从本地主机获取数据，并将返回的数据返回给服务器，然后服务器将信息显示给客户端。

这是我服务器端的错误：

/*

throw er; // Unhandled 'error' event
      ^

**Error [ERR_STREAM_WRITE_AFTER_END]: write after end**
    at write_ (_http_outgoing.js:572:17)
    at ServerResponse.write (_http_outgoing.js:567:10)
    at Socket.<anonymous> (/public_html/api/index.js:37:9)
    at Socket.emit (events.js:187:15)
    at /public_html/api/node_modules/socket.io/lib/socket.js:528:12
    at process._tickCallback (internal/process/next_tick.js:61:11)
Emitted 'error' event at:
    at writeAfterEndNT (_http_outgoing.js:634:7)
    at process._tickCallback (internal/process/next_tick.js:63:19)

    */

服务器端代码：

/*

throw er; // Unhandled 'error' event
      ^

**Error [ERR_STREAM_WRITE_AFTER_END]: write after end**
    at write_ (_http_outgoing.js:572:17)
    at ServerResponse.write (_http_outgoing.js:567:10)
    at Socket.<anonymous> (/public_html/api/index.js:37:9)
    at Socket.emit (events.js:187:15)
    at /public_html/api/node_modules/socket.io/lib/socket.js:528:12
    at process._tickCallback (internal/process/next_tick.js:61:11)
Emitted 'error' event at:
    at writeAfterEndNT (_http_outgoing.js:634:7)
    at process._tickCallback (internal/process/next_tick.js:63:19)

    */

并且请相信我在笔记本电脑上工作的客户端代码

var http = require('http');
var fs = require('fs');
var socket_g=null, numOfUsers=0;
var url = require('url'),qs = require('querystring');

var server = http.createServer(function(req, res) {
    if(numOfUsers!=0){
          var urlParts = url.parse(req.url, true),
         urlParams = urlParts.query, 
         urlPathname = urlParts.pathname,
         body = '',
         reqInfo = {};

          req.on('data', function (data) {
            body += data; 
          });

          req.on('end', function () {
            reqInfo.urlPathname = urlPathname; 
            reqInfo.urlParams = urlParams; 
            reqInfo.body = qs.parse(body); 
            reqInfo.urlParts = urlParts;
            console.log(reqInfo.urlPathname)
              socket_g.emit('event', { "path": reqInfo.urlPathname});
          });

        socket_g.on('data',function(data){
              console.log(data.c)
              if(data.c=='application/x-httpd-php' || data.c=='/'){
                    res.writeHead(200, { 'Content-Type': 'text/html' });
                    res.write(data.data);
                    res.end();
              }else{
                    res.writeHead(200, { 'Content-Type': data.c });
                    res.write(data.data);
                    res.end();
              }         
        });
    }else{
        res.writeHead(200, { 'Content-Type': 'text/html' });
            res.end("<h2>There is no client connected!</h2>");
    }
});

var io = require('socket.io').listen(server);
io.sockets.setMaxListeners(0);

io.sockets.on('connection', function (socket) {
    /*console msg*/
    console.log('user connected!');
    /*console msg*/
    socket.setMaxListeners(0);
    numOfUsers++;
    socket_g=socket;
    socket.on('disconnect', function(){
        numOfUsers++;
        /*console msg*/
        console.log('user disconnected');
        /*console msg*/
    });
});


server.listen(3333);

Answer 1

问题：

即使返回响应，您仍在监听“数据”事件。

解：

用.once听的事件一次针对一个特定的请求。

socket_g.once("data", function(data) {