Node.js http.ClientRequest.setHeader() Method
The http.ClientRequest.setHeader() is an inbuilt application programming interface of class ClientRequest within the HTTP module which is used to set the object of the header.
Syntax:
const request.setHeader(name, value)
Parameters: This method takes the name and value of the particular header as a parameter as key-value pair.
Return Value: This method has nothing to return.
Example 1: Filename-index.js
Javascript
// Node.js program to demonstrate the // request.setHeader() method // 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'); console.log("before operation :- " + req.getHeader('content-type')) // Removing header by using // removeHeader() method req.removeHeader('content-type') console.log("after operation :- " + req.getHeader('content-type')) process.exit(0) }); |
Run the index.js file using the following command:
node index.js
Output:
before operation :- text/html after operation :- undefined
Example 2: Filename-index.js
Javascript
// Node.js program to demonstrate the // request.setHeader() method // 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']); console.log("before operation :- " + req.getHeader('Cookie')) // Removing header by using // removeHeader() method req.removeHeader('Cookie') console.log("after operation :- " + req.getHeader('Cookie')) process.exit(0) }); |
Run the index.js file using the following command:
node index.js
Output:
before operation :- type=ninja,language=javascript after operation :- undefined
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_request_setheader_name_value