Here is a simple example of how to use the HTTP module in Node.js:
1. In order to use the HTTP module, you need to require it. This is done by using `require(‘http’)`.
```
const http = require(‘http’);
```
1. Next, you’re going to create the server using the createServer method.
```
const server = http.createServer((req, res) => {
res.writeHead(200, {‘Content-Type’: ‘text/html’});
res.end(‘Hello World!’);
});
```
In this example, we create a function that has two parameters (‘req’ and ‘res’) representing the request and the response objects of the server. The `writeHead` method sends a response header to the request. The first parameter is the status code, 200 means that all is OK, the second parameter is an object containing the response headers. The `end` method is used to end the response process, if no argument, a blank message is displayed.
1. Finally, you tell your server to listen for requests on a specific port:
```
server.listen(3000, ‘localhost’, () => {
console.log(‘Server listening on port 3000’);
});
```
This method causes server to listen to specified port (3000 in this case). Once the server starts listening, the callback function is executed.
Let’s put them together:
```
const http = require(‘http’);
const server = http.createServer((req, res) => {
res.writeHead(200, {‘Content-Type’: ‘text/html’});
res.end(‘Hello World!’);
});
server.listen(3000, ‘localhost’, () => {
console.log(‘Server is listening on port 3000’);
});
```
With the above code, you have created a simple web server in Node.js using the HTTP module and when you navigate to ‘http://localhost:3000’ in your browser, you should see “Hello World!”.
