我有我的第一个node.js应用程序(本地运行良好)-但我无法通过heroku部署它(第一次w/ heroku也是如此)。代码如下。SO不让我写这么多代码，所以我只想说在我的网络中本地运行代码也没有问题。
var http = require('http');
var fs = require('fs');
var path = require('path');
http.createServer(function (request, response) {
console.log('request starting for ');
console.log(request);
var filePath = '.' + request.url;
if (filePath == './')
filePath = './index.html';
console.log(filePath);
var extname = path.extname(filePath);
var contentType = 'text/html';
switch (extname) {
case '.js':
contentType = 'text/javascript';
break;
case '.css':
contentType = 'text/css';
break;
}
path.exists(filePath, function(exists) {
if (exists) {
fs.readFile(filePath, function(error, content) {
if (error) {
response.writeHead(500);
response.end();
}
else {
response.writeHead(200, { 'Content-Type': contentType });
response.end(content, 'utf-8');
}
});
}
else {
response.writeHead(404);
response.end();
}
});
}).listen(5000);
console.log('Server running at http://127.0.0.1:5000/');
知道吗?
对于那些同时传递端口和主机的程序，请记住Heroku不会绑定到本地主机。
您必须为主机传递0.0.0.0。
即使您使用了正确的端口。我们必须做出这样的调整:
# port (as described above) and host are both wrong
const host = 'localhost';
const port = 3000;
# use alternate localhost and the port Heroku assigns to $PORT
const host = '0.0.0.0';
const port = process.env.PORT || 3000;
然后你可以像往常一样启动服务器:
app.listen(port, host, function() {
console.log("Server started.......");
});
你可以在这里看到更多细节:https://help.heroku.com/P1AVPANS/why-is-my-node-js-app-crashing-with-an-r10-error
要解决这个问题，请遵循以下四个简单步骤:
在包装里。json文件:
1-设置主字段为服务器文件:
"main": "server.js" // <-- here set you server file
2-在app.listen函数中添加host参数
const port = process.env.PORT || 3000;
const host = '0.0.0.0'
app.listen(port, host, ()=> connsole.log(`server is running on port ${port}`)
3-添加postinstall脚本到包。json文件
"scripts": {
"postinstall": "npm run build", // <-- add this line
"start": "node server.js" // <-- change server.js to you main file
}
4-在包中添加引擎字段。json文件
"engines": {
"node": ">=14.0.O", // <-- change it to your node version. you can "node -v" in you command line
"npm": ">=7.7.0" // <-- change this to your npm version. you can use "npm -v" in the command line to get your npm version
}
如果你成功了，请告诉我!
对于那些同时传递端口和主机的程序，请记住Heroku不会绑定到本地主机。
您必须为主机传递0.0.0.0。
即使您使用了正确的端口。我们必须做出这样的调整:
# port (as described above) and host are both wrong
const host = 'localhost';
const port = 3000;
# use alternate localhost and the port Heroku assigns to $PORT
const host = '0.0.0.0';
const port = process.env.PORT || 3000;
然后你可以像往常一样启动服务器:
app.listen(port, host, function() {
console.log("Server started.......");
});
你可以在这里看到更多细节:https://help.heroku.com/P1AVPANS/why-is-my-node-js-app-crashing-with-an-r10-error
对我来说，问题在于资本化。你知道，在数小时的编码之后，你的眼睛会错过一些小细节。
在我的代码中，我使用process.env.port而不是process.env。PORT，所以要注意，PORT环境变量必须是大写的。
请看下面的例子:
const PORT = process.env.PORT || 3000;
const HOST = process.env.HOST || '0.0.0.0';
const express = require('express');
const app = express();
app.listen(PORT, HOST, () => {
console.log('Server started on ' + HOST + ':' + PORT);
})
