如何使用Node.js监听我的公共IP地址端口

Question

I want my Nodejs app to be accessed using my public IP address rather than the localhost. Right now for hosting my application on localhost I am doing:

app.listen(process.env.PORT||9000,()=>{
    console.log('Server is running on 9000!')
})

I wanted to setup Nodejs to Nodejs communication. I got help from stackoverflow and used the npm request package to send a post request from one of my nodejs server running on port 3000 to the one running on port 9000

const request = require("request");

var options = {
    method: 'POST',
    url: 'http://localhost:9000/',
    headers: { 'Content-Type': 'application/json' },
    body: { id: 1 },
    json: true
};

request(options, function (error, response, body) {
    if (error) throw new Error(error);

    // console.log(body);
    // Process the body and return the response.
    // return res.send(body);
});

I however want to use a public IP address because I want to host one of my server on Heroku. I will need the public IP address to create a communication

Answer 1

How to make your node.js listening on you public IP :

Actually your nodejs server listen on port 9000 , wich mean any communication on this port will be listen. THe only thing you need is to open this port to allow request from "outside".

For heroku , I don't think you can do this. But, according to the documentation, port 80 and 443 are already open , so if you change your port to one of these it would work!

Bonus :

How to open a port (on Linux)

You can use ufw, an easy and famous firewall manager.

sudo ufw allow 9000

This command will open your port 9000 and allow external request to resquest your nodejs server

I recommend you to read the doc of ufw before, and see this good tutorial