节点JS：无法获取/

Question

I know there are already different variations of the same question, however, mine is little different. I am getting this error cannot get/, this is my node js code

// set up ======================================================================
var express = require('express');
var path = require('path');
var app = express();                        // create our app w/ express
var mongoose = require('mongoose');                 // mongoose for mongodb
var port = process.env.PORT || 8080;                // set the port
//var database = require('./config/database');          // load the database config
var morgan = require('morgan');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var io = require('socket.io');
var messageId = {};
    http = require('http'),
    server = http.createServer(function (req, res) {
       res.writeHead(200,{'content-type':'text/plain'});
        res.write("Sever On");
        res.end();
    }),
    io = io.listen(server);
// configuration ===============================================================
//mongoose.connect(database.localUrl);  // Connect to local MongoDB instance. A remoteUrl is also available (modulus.io)

//app.use(express.static('./public'));      // set the static files location /public/img will be /img for users
//app.use(morgan('dev')); // log every request to the console
//app.use(bodyParser.urlencoded({'extended': 'true'})); // parse application/x-www-form-urlencoded
//app.use(bodyParser.json()); // parse application/json
//app.use(bodyParser.json({type: 'application/vnd.api+json'})); // parse application/vnd.api+json as json
//app.use(methodOverride('X-HTTP-Method-Override')); // override with the X-HTTP-Method-Override header in the request


// routes ======================================================================
//require('./app/routes.js')(app);

// listen (start app with node server.js) ======================================
app.listen(port);
console.log("App listening on port " + port);

My Package.json

{
  "name": "node-todo",
  "version": "0.0.1",
  "description": "Simple todo application.",
  "main": "server.js",
  "author": "Scotch",
  "dependencies": {
    "body-parser": "^1.18.2",
    "mongoose": "4.10.8",
    "express": "^4.10.8",
    "method-override": "^2.3.10",
    "morgan": "^1.9.0",
    "socket.io": "^2.0.3"
  }
}

As you might have noticed, I am just trying to create a response using http.createServer(). Please let me know what did I do wrong.

Answer 1

The below code just creates the server -

server = http.createServer();

But to send any response to client you must first listen to request ie create routes -

app.get('/', (req, res) => {
  res.send('blah');
}

Other stuff you have written correctly I guess. I hope it fixes your problem.

Answer 2

There are two servers created in your script. You only need to create any one of them.

1. Core HTTP server with http.createServer() but you haven't bound any port to it.
2. You have created an express server( var app = express(); app.listen(port); ). Here you provided port but haven't provided any routing information.

Here is what you can do :

1. If you want to use core HTTP server

replace your sever initilization with

server = http.createServer(function (req, res) {
    res.writeHead(200,{'content-type':'text/plain'});
    res.write("Sever On");
    res.end();
}).listen(port),

2. If you want to use express

Add root route

app.get('/', function (req, res) {
    res.send('hello world')
})

before app.listen(port);