socket.io&快递：404未找到 [英] socket.io & express: 404 not found

问题描述

我的app.js

const express = require('express'),
      morgan = require('morgan'),
      bodyParser = require('body-parser'),
      path = require('path'),
      mongoose = require('mongoose'),
      app = express(),
      config = require('./config'),
      Note = require('./models/note'),
      server = require('http').createServer(app),
      io = require('socket.io')(server),
      socket = io.socket;

mongoose.connect('mongodb://'+config.db.host+'/'+config.db.name);

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
// Serve static assets
app.use(express.static(path.resolve(__dirname, '..', 'build')));

app.use(function(req, res, next) {
  const allowedOrigins = [
    'http://127.0.0.1:8000',  
    'http://localhost:8000',  
    'http://127.0.0.1:3000',  
    'http://localhost:3000'];
  const origin = req.headers.origin;
  if(allowedOrigins.indexOf(origin) > -1){
    res.setHeader('Access-Control-Allow-Origin', origin);
  }
  //res.header("Access-Control-Allow-Origin", "127.0.0.1 localhost");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  res.header('Access-Control-Allow-Credentials', true);
  next();
});

调用 socket.emit（）上述代码之后的处理程序。

calling socket.emit() in handlers after above codes.

我的index.js

My index.js

'use strict';

const app = require('./app'),
      // server = http.createServer(app),
      PORT = process.env.PORT || 8000;

app.listen(PORT, () => {
  console.log(`REST API running on ${PORT}!`);
});

控制台输出：

任何想法？谢谢

推荐答案

如果你要这样做：

server = require('http').createServer(app),

然后，你不能做：

app.listen(PORT, ...);

因为 app.listen（）将创建一个新的和不同的服务器和socket.io将不会与那个相关联。

because app.listen() will create a new and different server and socket.io will not be associated with that one.

相反，你需要做：

server.listen(PORT, ...)

使用app.js中的服务器值。而且，如果你想从app.js的服务器中的 require（），还需要从app.js导出它（别的我看不到你的代码

using the server value from app.js. And, if you want to require() in the server from app.js, you also need to export it from app.js (something else I don't see your code doing).

为了参考， app.listen（） 的代码，这样做：

For reference, the code for app.listen(), does this:

app.listen = function listen() {
  var server = http.createServer(this);
  return server.listen.apply(server, arguments);
};

您可以看到如何创建与传递给socket.io的服务器不同的服务器。因此，传递给socket.io的文件从未启动，因此socket.io不起作用。

You can see how it creates a different server than the one you passed to socket.io. Thus the one you passed to socket.io is never started and thus socket.io does not work.

这篇关于socket.io&快递：404未找到的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！