javascript - I can't setup socket.io -

so decided use socket.io, send data serverside client side, giving me error :

vm134:3511 http://[url]/socket.io/?eio=3&transport=polling&t=ls52pfm 404 (not found) 

and :

failed load resource: server responded status of 404 (not found) 

and here app.js :

var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var logger = require('morgan'); var cookieparser = require('cookie-parser'); var bodyparser = require('body-parser');  var routes = require('./routes/index'); var login = require('./routes/login'); var facebook = require('./routes/facebook'); var dev = require('./routes/dev'); var users = require('./routes/users'); var ux = require('./routes/ux'); var session = require('express-session'); //maziar added var addplaces = require('./routes/addplaces');   // socket.io stuff :  var app = express()   , http = require('http')   , server = http.createserver(app)   , io = require('socket.io').listen(server); 

index.js :

// io socket{ var app = require('express')(); var http = require('http').server(app);    //io socket end. } function emit() { io.sockets.emit('reload'); };  http.listen(3000, function(){   console.log('listening on *:3000'); }); 

and client side code :

var socket = io(); socket.on("reload", function(r) { alert('love you!'); }); 

and in html part have added in head :

<script src="scripts/socket.io.js"></script> <script src="https://cdn.socket.io/socket.io-1.0.0.js"></script> 

( have downloaded socket.io.js file locally make sure can access it! )

package.json :

  "dependencies": {     "body-parser": "~1.13.2",     "chance": "^1.0.3",     "connect-ensure-login": "^0.1.1",     "cookie-parser": "~1.3.5",     "debug": "~2.2.0",     "express": "~4.13.1",     "express-session": "^1.13.0",     "hjs": "~0.0.6",     "mongodb": "^2.1.19",     "morgan": "~1.6.1",     "passport": "^0.3.2",     "passport-local": "^1.0.0",     "request": "^2.72.0",     "serve-favicon": "~2.3.0",     "util": "^0.10.3",     "socket.io": "1.2.0"   } 

temp build :

 /tmp/build_39cf5617a994685d99e4b2a55679a42b remote:        ├── chance@1.0.4 remote:        ├── connect-ensure-login@0.1.1 remote:        ├─┬ express-session@1.14.1 remote:        │ ├── cookie@0.3.1 remote:        │ ├── cookie-signature@1.0.6 remote:        │ ├── crc@3.4.0 remote:        │ ├── depd@1.1.0 remote:        │ ├── on-headers@1.0.1 remote:        │ ├── parseurl@1.3.1 remote:        │ ├─┬ uid-safe@2.1.2 remote:        │ │ ├── base64-url@1.3.2 remote:        │ │ └── random-bytes@1.0.0 remote:        │ └── utils-merge@1.0.0 remote:        ├─┬ mongodb@2.2.9 remote:        │ ├── es6-promise@3.2.1 remote:        │ ├─┬ mongodb-core@2.0.11 remote:        │ │ ├── bson@0.5.4 remote:        │ │ └─┬ require_optional@1.0.0 remote:        │ │   ├── resolve-from@2.0.0 remote:        │ │   └── semver@5.3.0 remote:        │ └─┬ readable-stream@2.1.5 remote:        │   ├── buffer-shims@1.0.0 remote:        │   ├── core-util-is@1.0.2 remote:        │   ├── inherits@2.0.3 remote:        │   ├── isarray@1.0.0 remote:        │   ├── process-nextick-args@1.0.7 remote:        │   ├── string_decoder@0.10.31 remote:        │   └── util-deprecate@1.0.2 remote:        ├─┬ passport@0.3.2 remote:        │ ├── passport-strategy@1.0.0 remote:        │ └── pause@0.0.1 remote:        ├── passport-local@1.0.0 remote:        └─┬ socket.io@1.4.8 remote:        ├─┬ engine.io@1.6.11 remote:        │ ├─┬ accepts@1.1.4 remote:        │ │ ├─┬ mime-types@2.0.14 remote:        │ │ │ └── mime-db@1.12.0 remote:        │ │ └── negotiator@0.4.9 remote:        │ ├── base64id@0.1.0 remote:        │ ├─┬ engine.io-parser@1.2.4 remote:        │ │ ├── after@0.8.1 remote:        │ │ ├── arraybuffer.slice@0.0.6 remote:        │ │ ├── base64-arraybuffer@0.1.2 remote:        │ │ ├── blob@0.0.4 remote:        │ │ ├─┬ has-binary@0.1.6 remote:        │ │ │ └── isarray@0.0.1 remote:        │ │ └── utf8@2.1.0 remote:        │ └─┬ ws@1.1.0 remote:        │   ├── options@0.0.6 remote:        │   └── ultron@1.0.2 remote:        ├─┬ has-binary@0.1.7 remote:        │ └── isarray@0.0.1 remote:        ├─┬ socket.io-adapter@0.4.0 remote:        │ └─┬ socket.io-parser@2.2.2 remote:        │   ├── debug@0.7.4 remote:        │   ├── isarray@0.0.1 remote:        │   └── json3@3.2.6 remote:        ├─┬ socket.io-client@1.4.8 remote:        │ ├── backo2@1.0.2 remote:        │ ├── component-bind@1.0.0 remote:        │ ├── component-emitter@1.2.0 remote:        │ ├─┬ engine.io-client@1.6.11 remote:        │ │ ├── component-inherit@0.0.3 remote:        │ │ ├── has-cors@1.1.0 remote:        │ │ ├── parsejson@0.0.1 remote:        │ │ ├── parseqs@0.0.2 remote:        │ │ ├── ws@1.0.1 remote:        │ │ ├── xmlhttprequest-ssl@1.5.1 remote:        │ │ └── yeast@0.1.2 remote:        │ ├── indexof@0.0.1 remote:        │ ├── object-component@0.0.3 remote:        │ ├─┬ parseuri@0.0.4 remote:        │ │ └─┬ better-assert@1.0.2 remote:        │ │   └── callsite@1.0.0 remote:        │ └── to-array@0.1.4 remote:        └─┬ socket.io-parser@2.2.6 remote:        ├── benchmark@1.0.0 remote:        ├── component-emitter@1.1.2 remote:        ├── isarray@0.0.1 remote:        └── json3@3.3.2 

errors : in console :

at=info method=get path="/socket.io/socket.io.js" host=host request_id=71077d84-55ec-4f02-b2bf-8dd79c29ac89 fwd="84.208.103.77" dyno=web.1 connect=1ms service=6ms status=404 bytes=243