I have been trying to run a simple node.js server using express from WSL2 at port 3000
const express = require('express');
const app = express();
app.get('/', (req, res) => {
res.send('<h1>Hello World</h1>');
});
app.listen(3000, () => {
console.log('Run at http://localhost:3000');
});
I can connect from in my computer's browser and see the 'Hello World' but I'm not able to connect from a external device's browser (My phone,etc...) i put my windows ip both wsl2 ip , but none works
also i tried to set a host in '0.0.0.0' like this but it didn't work either
app.listen(3000, '0.0.0.0', () => {
console.log('Run at http://localhost:3000');
});
When i try to run the same server but using git bash in my windows everything works alright...
Any suggestions ?
I'd appreciate your help!
I had the same problem and found the answer in a reddit discussion
Change o route from "/" to "/test" and return a "ok" and you'll se that your server is responding
Related
I have centos 6 running nodejs 10,
and i have this scaffold code to test my application server but still giving Error: connect ECONNREFUSED ip:4000
const express = require('express')
const app = express()
const port = 3432
const https = require('https');
app.get('/', (req, res) => {
res.send('Hello World!')
})
app.listen(port, () => {
console.log(`Example app listening on port ${port}`)
})
When i try to put the url in the browser it says This site can’t be reached.
I like server is not running but it is running.
The error was that server administrator dont enable the port for me
This question already has answers here:
Containerized Node server inaccessible with server.listen(port, '127.0.0.1')
(2 answers)
Closed 8 months ago.
I am building container with node.
I have two type of codes. I think two codes very simple and similar. and package.json and Dockerfile is same. just different code.
but I can connect app in container. but the other one can't connect app in container.
This code is working well in container.
const express = require('express')
const PORT = 3000;
const app = express();
app.get('/',(req,res)=>{
res.send('Hello World');
});
app.listen(PORT);
console.log('Running');
but This code is not working What wrong with this? this is node official sample code.
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello World');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
please tell me what problem is.
Thank you in advance
The sample code works when run on the host machine, but not when run in a container.
The issue is that the sample code binds to the 127.0.0.1 IP address. That means that it'll only accept connections from localhost.
In a container, localhost is the container itself. So when you try to connect from the docker host, it looks like the connection comes from another machine and the connection is rejected.
To fix it, you need to make it accept connections from outside the container. You can do that by changing the hostname variable to 0.0.0.0 like this
const http = require('http');
const hostname = '0.0.0.0';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello World');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
You can also leave out the hostname variable on the server.listen call as you've done in the first program. The default value is 0.0.0.0, so leaving it out also works.
I can't figure out how to get my server to respond with Hello World.
I don't even know what IP address is. Is the ip listed on the tab of my terminal it?
I just created an EC2 environment with the default Node.js template.
Do I need to setup more things beforehand?
https://i.stack.imgur.com/4m85x.png
Try the solution bellow and let me know if you need any explanation:
const http = require("http");
const port = 3000; // make sure the port number is not used
const requestHandler = (req, res) => {
req.on('Error occurerd', (err) => {
console.error(err);
res.end();
});
res.end("Hello from AWS Cloud9!");
}
const server = http.createServer(requestHandler);
server.listen(port, () => {
console.log(`Server is listening on port ${port}!`);
// Run your script then copy past this url in your browser 127.0.0.1:3000
});
I have set up vmware workstation, Ubuntu 16.06 desktop as my guest machines, windows 10 as host.
nodejs 9.4.0
express 4.16.2
and simple server HTTP and express:
const http = require('http'),
PORT = 4000;
http.createServer((req, res) => {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write('It works!');
res.end();
}).listen(PORT);
console.log("Listening on port " + PORT);
**/
/*** EXPRESS BASED TEST*/
const express = require('express');
const app = express();
PORT = 4000;
app.get('/', (req, res)=>{
res.send("it works!");
})
app.listen(PORT, 'localhost', ()=>{
console.log('Listening on port: ' + PORT)
});
/****/
What happens is, when I try to open test webpage from my host browser when guest runnin express - I get ERR_CONNECTION_REFUSED. BUT when i start simple http server - it connects! I tried to connect with telnet, ssh... turn of firewall... behavior is the same...
Is it something wrong with express? Is there a way to fix it?
The solutions is here:
Node.js connect only works on localhost
In my express app I make it listen on localhost, which is 127.0.0.1 and which is loopback address. After changing it to 0.0.0.0 the problem was solved.
i'm developing a REST API with node js on linux.
This my first sample code to try if all works fine:
'use strict';
var express = require("express");
var app = express();
var port = process.env.PORT || 8080 ;
app.listen(port, "127.0.0.1", function(){
console.log("Express server is listening on port ", port);
});
i have try to call localhost:8080 into linux server and works fine.
If i try to call trhe IP of server with this port by a external IP the express server not responding.
Any help about this?
Thanks
Your second parameter to the app.listen() api, which you set to "127.0.0.1" is the hostname. This will cause node to only listen for requests matching that host name from the request domain.
This is an optional parameter.
Perhaps try the app.listen(port, callback) form of the api?
app.listen(port, function () {
console.log("Express server is listening on port ", port);
});
app.get('/', function (req, res) {
res.send('Hello world!')
});
Or you can move the [hostname] parameter to a configuration file if you don't want your service to listen to every host name.
See the server.listen() documentation for better insight into parameter default behaviour.
Try this so your app listens on all network interfaces and not only on localhost:
app.listen(port, "0.0.0.0", function(){
console.log("Express server is listening on port ", port);
});