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Node.js http.IncomingMessage.headers Method
  • Last Updated : 20 Dec, 2020

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

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 object.

Example 1:



Filename: index.js

Javascript




// Node.js program to demonstrate the  
// request.headers method 
  
// Importing http module 
var http = require('http');
  
// Setting up PORT 
const PORT = process.env.PORT || 3000;
  
// Creating http Server 
var httpServer = http.createServer(
    function (request, response) {
  
  // Getting request/reponse header
  // by using request.complete 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, 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 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
  // Getting request/reponse header
  // by using request.complete 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 
var 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, you will see the following output:

hello world!!

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




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