Question

我正在将服务器部署到Heroku，但是由于某种原因，网络显示它仍在向本地主机发出请求，而不是动态地将端口号注入到process.env.PORT

这是我的服务器的设置。

require('dotenv').config();
const express = require("express");
const graphqlHTTP = require("express-graphql");
const schema = require('./schema/schema');
const mongoose = require('mongoose');
const cors = require('cors');
const bodyParser = require('body-parser');

mongoose.connect(process.env.mongodburi, { useNewUrlParser: true })

mongoose.connection.once('open', ()=>{
  console.log('Connected to database');
});

const app = express();
app.use(cors());
app.use(express.static("public"));

app.use('/graphql', bodyParser.json(), graphqlHTTP({
  schema,
  graphiql: true
}));

app.withCredentials = true;

app.use('/', (req, res) => res.send("Welcome to read my profile"));

const port = process.env.PORT;
app.listen(port, ()=>{
  console.log(`Now listening requests on port:${port}`);
})

Answer 1

使用此

app.listen(process.env.PORT || 3000, function(){
    console.log("Express server listening on port %d in %s mode", this.address().port, app.settings.env);
});

或运行mentioned提到的$ heroku config:set PORT=3333

Heroku无法将端口号注入到process.env.PORT

1 个答案: