NODE JS BUILT IN MODULE - HTTP

---

1) Creating an HTTP Server

---

1) We need to first import the 'http' module using the require function
                            var http = require ('http');

2) We will use the method createServer() to create an HTTP server:
                            http.createServer(function (req, res){

                            ... // your code here

                            }).listen(PORT_NUMBER); 

Example: 

// Import the built-in 'http' module  const http = require('http');  // Define the hostname and port number  const hostname = '127.0.0.1';  const port = 3000;  // Create an HTTP server  const server = http.createServer((req, res) => {          // Set the HTTP status code and content type in the response header          res.writeHead(200, {'Content-Type': 'text/plain'});          // Send the response body          res.end('Hello, world!\n');          });           // Start the server and listen on the specified port and hostname  server.listen(port, hostname, () => {         console.log(`Server running at http://${hostname}:${port}/`);  });

---

2) GET REQUEST to query

---

1) We will be using http.request() method to send an HTTP GET request to a server and handle the response.

2) Similarly, we will be importing the module using- 

                            var http = require ('http');

3) We will be defining the options for the HTTP request where we will be mentioning the hostname, port number, path (if any), and the method.

                            const options = {

                            hostname: 'jsonplaceholder.typicode.com',

                            port: 80,

                            path: '/posts',

                            method: 'GET'

                            }

4) Creating a http.request() method in which we are going to pass the above options object.

5) Store the response and display it or process it when the response is complete.

Example: 

// Import the built-in 'http' module  const http = require('http');  // Define the options for the HTTP request  const options = {          hostname: 'jsonplaceholder.typicode.com',          port: 80,          path: '/posts',          method: 'GET' }; // Create the HTTP request  const req = http.request(options, (res) => {          // Initialize a variable to store the response data          let data = '';          // Concatenate chunks of data as they are received          res.on('data', (chunk) => {                  data += chunk;          });           // When the response is complete, log the data to the console          res.on('end', () => {              console.log(data);          });  });  // Handle errors that occur during the request  req.on('error', (error) => {          console.error('An error occurred:', error);  });  // End the request  req.end();

Click Here to Learn about the Built-in Module - URL