Heroku 节点.js - 错误 R10(引导超时)> Web 进程无法绑定到$PORT

Question

当我在Heroku上部署我的网站时，它会说：-

应用程序错误

应用程序中出现错误，无法提供您的页面。如果您是应用程序所有者，请查看日志以了解详细信息。您可以使用以下命令从Heroku CLI执行此操作Heroku日志——尾部

在日志中，当我查看时，似乎没有什么大的问题。它给出了：-

2020-09-20T23:56:47.790226+00:00 app[web.1]: 
2020-09-20T23:56:48.040459+00:00 app[web.1]: SERVER IS RUNNIG AT PORT 8000
2020-09-20T23:56:48.040768+00:00 app[web.1]: Server runnung at http://127.0.0.1:5500
2020-09-20T23:57:44.991177+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-09-20T23:57:45.017244+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-09-20T23:57:45.087257+00:00 heroku[web.1]: Process exited with status 137
2020-09-20T23:57:45.132990+00:00 heroku[web.1]: State changed from starting to crashed
2020-09-21T02:05:44.125661+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=sheetsw.herokuapp.com request_id=b87a2aae-a1d1-44d4-9f4e-2d10421edec6 fwd="27.60.151.127" dyno= connect= service= status=503 bytes= protocol=https
2020-09-21T02:05:46.906817+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=sheetsw.herokuapp.com request_id=a46e447c-e111-4954-a6c6-a1e928013a82 fwd="27.60.151.127" dyno= connect= service= status=503 bytes= protocol=https
2020-09-21T02:06:05.637299+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=sheetsw.herokuapp.com request_id=d6aa7d9b-60eb-450c-8ceb-c063faad3917 fwd="27.60.151.127" dyno= connect= service= status=503 bytes= protocol=https

你能告诉我哪里错了，为什么错了吗？我该如何克服这个问题？

我的server.js文件：-

const express = require("express");
const fs = require('fs');
const nodemailer = require('nodemailer');
const  bodyParser = require('body-parser');
/** 
const port= 80; 
**/
const hostname= '127.0.0.1';
const port= 5500;
const path = require('path');

const app = express();
app.get('/register.html',(req,res) => {
res.sendFile(__dirname + '/register.html')
})
/**app.use(express.static('./')); 
**/
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
sending();

function sending(){

const transporter = nodemailer.createTransport({
service:'gmail',
auth:{
user:'[e-mail]',
pass:'free_fire123'        
}
});
function sendEmail(mail)
{
var mailOptions= {
from: '[e-mail]',
to:mail.to,
subject: mail.subject,
html: mail.body
}
transporter.sendMail(mailOptions, function(err, info) {
if(err){
console.log(err+"                    "+mail.to)
}
else {
console.log("Email sent: "+info.response)
}
})
}
app.post('/register.html', (req,res)=> {
mail= {
to:req.body.to_address,
subject:"Sheets_Wrap - project details",
body:req.body.NAME + "    ------------/////////////------------     "+ req.body.phone + "    ------------/////////////------------     " + req.body.email_body + "    ------------/////////////------------     " + req.body.code
}
sendEmail(mail)
res.redirect('/register.html')
})

app.listen(port, ()=> {
console.log('SERVER IS RUNNIG AT PORT 8000')
console.log(`Server runnung at http://localhost:${port}/register.html`);
})
}

Answer 1

问题：您的Node.js应用程序未正确配置为绑定到Heroku通过$port环境变量提供的端口以外的端口。

Heroku dynos公开了一个动态端口供您的应用程序绑定。此值在$port env变量中公开。您必须更改代码才能绑定到此端口。例如：

//Replace your hardcoded port to process.env.PORT
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
console.log(`Our app is running on port ${ PORT }`);
});

这将使用$PORT env变量(如果可用(，或者回退到默认端口(对本地开发有用(。请注意，在Heroku上浏览应用程序时，您仍然使用端口80([yourapplication].herokuapp.com(，而不是进程绑定的端口。