javascript - 错误 [ERR_STREAM_WRITE_AFTER_END] : write after end [npm-request with socket. io]

Question

在我的服务器端，我有套接字服务器在监听，在我自己的笔记本电脑上，我有 socket.io-client 服务，只要我打开它们，它们就会连接。

当其他人向我的服务器发出请求时，服务器通过套接字将该请求发送到我的笔记本电脑，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，然后服务器将该信息显示给客户端。

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:

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);

And belove my client side code, which is working on my laptop

var socket = require('socket.io-client')('http://*.*.*.*:3333/');
var http=require("http");
var r = require('request');
var mime = require('mime');
var path = require('path');

socket.on('connect', function(){
	console.log("connected");
});

socket.on('event', function(data){
	console.log(mime.getType(path.extname(data.path).substr(1)));
	var contentType=mime.getType(path.extname(data.path).substr(1));

  r.get({url: "http://localhost/check"+data.path},
		function(error, response, body){
		   //console.log(body);
		   if(contentType){
		   	socket.emit('data', { "data": body,'c':contentType });
		   }
	});

});

socket.on('disconnect', function(){
	console.log("disconnected")
});

Answer 1

问题:

即使在返回响应后，您仍在收听“数据”事件。

解决方案:

使用 .once 为该特定请求监听一次事件。

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