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Node.js http.server.maxHeadersCount Property

  • Last Updated : 12 Jan, 2021

The http.server.maxHeadersCount is an inbuilt application programming interface of class Server within the HTTP module which is used to get the maximum incoming headers count.

Syntax:

const server.maxHeadersCount

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

Return Value: TIt does not return any value.

Example 1: Filename-index.js



Javascript




// Node.js program to demonstrate the  
// server.maxHeadersCount property
  
// 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 the reference of the 
    // underlying socket object
    // by using socket method
    const value = response.socket;
  
    // Display result by using end() method
    response.end("socket buffersize : " 
        + value.bufferSize, 'utf8', () => {
            console.log("displaying the result...");
  
            // Closing server 
            // by using close() method
            httpServer.close(() => {
                console.log("server is closed")
            })
    });
});
  
// Listening to http Server 
// by using listen() method
httpServer.listen(PORT, () => {
    console.log("Server is running at port 3000...");
});
  
// Getting max header count 
// by using maxHeadersCount method
const v = httpServer.maxHeadersCount
  
// Display the result
console.log('maximum header count :-' + v)

Run the index.js file using the following command:

node index.js

Output:

maximum header count :-null
Server is running at port 3000...
displaying the result...
server is closed

Now run http://localhost:3000/ in the browser and you will see the following output on screen:

socket buffersize : 0

Example 2: Filename-index.js

Javascript




// Node.js program to demonstrate the  
// server.maxHeadersCount method
  
// Importing http module 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
    // Getting the reference of the 
    // underlying socket object
    // by using socket method
    const value = response.socket;
  
    // Display result by using end() method
    response.end("socket local address : "
        + value.localAddress, 'utf8', () => {
            console.log("displaying the result...");
  
            // Closing server 
            // by using close() method
            httpServer.close(() => {
                console.log("server is closed")
            })
        });
};
  
// Listening to http Server 
// by using listen() method
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => {
    console.log("Server is running at port 3000...");
});
  
// Getting max header count 
// by using maxHeadersCount method
const v = httpServer.maxHeadersCount
  
if (v || v > 1) {
    console.log("maximum header count is greater than 1")
} else {
    console.log("maximum header count is less than 1")
}

Run the index.js file using the following command:

node index.js

Output:

maximum header count is less than 1
Server is running at port 3000...
displaying the result...
server is closed

Now run http://localhost:3000/ in the browser and you will see the following output on screen:

socket local address : ::1

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




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