Node.js http.ClientRequest.getHeader() API

The http.ClientRequest.getHeader() is  an inbuilt application programming interface of class ClientRequest within http module which is used to get the header object of the particular header name.

Syntax:

const request.getHeader(name)

Parameters: This method takes the name of the header as a parameter.

Return Value : This method returns the object of the header as output.

Example 1:

Javascript

// Node.js program to demonstrate the
// request.getHeader() APi

// Importing http module
const http = require('http');

// Create an HTTP server
http.createServer((req, res) => {}).listen(3000, '127.0.0.1', () => {

  // getting client request
  const req = http.request({
    port: 3000,
    host: '127.0.0.1',
  });

  req.setHeader('content-type', 'text/html');

  // getting header
  // by using getHeader() api
  console.log("header :- " + req.getHeader('content-type'))

  process.exit(0)
});

Output:

Example 2:

Javascript

// Node.js program to demonstrate the
// request.getHeader() APi

// Importing http module
const http = require('http');

// Create an HTTP server
const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('okay');
});

// Now that server is running
server.listen(3000, '127.0.0.1', () => {

  // make a request
  const options = {
    port: 3000,
    host: '127.0.0.1',
    headers: {
      'Connection': 'Upgrade',
      'Upgrade': 'websocket'
    }
  };

  // getting client request
  const req = http.request(options);

  req.setHeader('Cookie', ['type=ninja', 'language=javascript']);

  // getting header
  // by using getHeader() api
  const v = req.getHeader('Cookie');

  // display the result
  console.log("header :- " + v)

  process.exit(0)
});

Output:

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_request_getheader_name