Node.js http.IncomingMessage.headers Method

The http.IncomingMessage.headers is an inbuilt application programming interface of class IncomingMessage within the HTTP module which is used to get all the request/response headers objects.

Syntax:

const message.headers

Parameters: This method does not accept any argument as a parameter.

Return Value: This method returns all the request/response headers objects.

Example 1:

Filename: index.js

Javascript

// Node.js program to demonstrate the
// request.headers method

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

// Setting up PORT
const PORT = process.env.PORT || 3000;

// Creating http Server
const httpServer = http.createServer(
    function (request, response) {
        // Getting request/response header
        // by using request.headers method
        const value = request.headers;

        // Display header
        console.log(value.connection)

        // Display result
        response.end("hello world", 'utf8', () => {
            console.log("displaying the result...");

            httpServer.close(() => {
                console.log("server is closed")
            })
        });
    });

// Listening to http Server
httpServer.listen(PORT, () => {
    console.log("Server is running at port 3000...");
});

Run the index.js file using the following command.

node index.js

Output:

Output: In-Console
Server is running at port 3000...
keep-alive
displaying the result...

Now go to http://localhost:3000/ in the browser, and you will see the following output:

hello world

Example 2:

Filename: index.js

Javascript

// Node.js program to demonstrate the
// request.headers Method

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

// Request and response handler
const http2Handlers = (request, response) => {
    // Getting request/response header
    // by using request.headers method
    const value = request.headers;

    // Display header
    console.log(value.host)

    // Display result
    response.end("hello world!!", 'utf8', () => {
        console.log("displaying the result...");

        httpServer.close(() => {
            console.log("server is closed")
        })
    });
};

// Creating http Server
const httpServer = http.createServer(
    http2Handlers).listen(3000, () => {
        console.log("Server is running at port 3000...");
    });

Run the index.js file using the following command.

node index.js

Output:

Server is running at port 3000...
localhost:3000
displaying the result...

Now go to http://localhost:3000/ in the browser, and you will see the following output:

hello world!!

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