Anwendungsfehler beim Bereitstellen von MEAN app auf Heroku

Question

Ich baue meine erste MEAN app und möchte sie bereitstellen.Es funktioniert gut in meinem System, aber wenn ich es auf Heroku bereitstellen, bekomme ich einen Anwendungsfehler.Ich starte npm start to Suchen Sie nach einem Fehler in der Heroku-Konsole, aber die Konsole protokollierte eine Erfolgsmeldung "Server gestartet", was bedeutet, dass der Knotenserver einwandfrei funktioniert.

app.js

const express = require('express'); 
const bodyParser = require('body-parser'); 
const session = require('express-session'); 
const mongoose = require('mongoose'); 
const mongoStore = require('connect-mongo')(session); 
const path = require('path'); 
const app = express(); 

const index = require('./routes/index'); 

//using 'session' 
app.use(session({ 
secret: 'Xiomi', 
resave: true, 
saveUninitialized: true, 
store: new mongoStore({ mongooseConnection: mongoose.connection }) 
})); 

//use static files 
app.use(express.static(path.join(__dirname, 'public'))); 

// use 'body-parser' in app 
app.use(bodyParser.urlencoded({extended:true})); 
app.use(bodyParser.json()); 

//making api accessable 
app.use(function(req,res,next){ 
    res.header("Access-Control-Allow-Origin","*"); 
    res.header("Access-Control-Allow-Methods","GET, POST, PUT") 
    res.header("Access-Control-Allow-Headers","Origin, X-Requested- 
    With,Content-Type,Authorization,Accept"); 
next(); 
}); 

// use 'index' route 
app.use('/api',index); 


app.get('*', (req, res) => { 
    res.sendFile(path.join(__dirname, '/public/index.html')); 
}); 

    // Handle '404' 

    app.use((req,res,next) => { 
    const error = new Error('Not Found'); 
    error.status = 404; 
    next(error); 
    }); 

    // Error Handler 
    app.use((err,req,res,next) => { 
    res.json({ 
    message:err.message, 
    err 
    }); 
    }); 

    module.exports = app; 

start.js

//dot env includes 
require('dotenv').config({path:'info.env'}); 

//mongoose connection setup 
const mongoose = require('mongoose'); 


mongoose.connect(process.env.DB,{useMongoClient:true}); 
mongoose.Promise = global.Promise; //use Es6 promises 

mongoose.connection.on('error',err => { 
    console.log("Mongoose connection failed"); 
}); 

//require models 
require('./models/question'); 
require('./models/answer'); 
require('./models/user'); 

const app = require('./server'); 

app.set('port',process.env.port||4040); 
app.listen(app.get('port'),()=>{ 
    console.log("Server started"); 
}); 

Hier sind Heroku für meine Anwendung protokolliert:

2017-12-16T02:26:07.368109+00:00 heroku[run.2613]: Starting process with command `npm start` 
2017-12-16T02:26:07.625833+00:00 heroku[run.2613]: State changed from starting to up 
2017-12-16T02:26:15.275993+00:00 heroku[run.2613]: Client connection closed. Sending SIGHUP to all processes 
2017-12-16T02:26:15.809932+00:00 heroku[run.2613]: State changed from up to complete 
2017-12-16T02:26:15.796854+00:00 heroku[run.2613]: Process exited with status 10 
2017-12-16T02:26:21.198223+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=qa-application-mean.herokuapp.com request_id=5afdf0d7-af4f-47d1-954b-5e0141f116b8 fwd="117.205.140.102" dyno= connect= service= status=503 bytes= protocol=https 
2017-12-16T02:26:23.974360+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=qa-application-mean.herokuapp.com request_id=a6b2524d-8412-45c4-9f0f-5d4fcd15417e fwd="117.205.140.102" dyno= connect= service= status=503 bytes= protocol=https 
2017-12-16T02:26:46.596768+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/api/questions" host=qa-application-mean.herokuapp.com request_id=a8859faa-c2fb-4c88-b295-da472c7b7ecc fwd="117.205.140.102" dyno= connect= service= status=503 bytes= protocol=https 
2017-12-16T02:26:48.979172+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=qa-application-mean.herokuapp.com request_id=f721e237-b4c8-465c-8073-6ab5d93f5160 fwd="117.205.140.102" dyno= connect= service= status=503 bytes= protocol=https 

Answer 1

Heroku documentation sagt, dass Sie benötigen, um Ihre binden Port zu PORT. Vielleicht möchten Sie Ihren Code in

ändern

app.set('port', process.env.PORT || 4040);