Node.js http.ClientRequest.connection Property

The http.ClientRequest.connection is an inbuilt application programming interface of class ClientRequest within the HTTP module which is used to get the reference of underlying client request socket.

Syntax:

const request.connection

Parameters: It does not accept any argument as the parameter.

Return Value: It does not return any value.

Example 1: Filename-index.js

Javascript

// Node.js program to demonstrate the
// request.connection 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);

    // Getting request socket
    // by using connection method
    const v = req.connection;

    // Display the result
    console.log("request socket :- " + v)

    process.exit(0)
});

Run the index.js file using the following command:

node index.js

Output:

request socket :- null

Example 2: Filename-index.js

Javascript

// Node.js program to demonstrate the
// request.connection 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',
    });

    // Getting request socket
    // by using connection method
    if (req.connection) {
        console.log("Requested for Connection")
    } else {
        console.log("Not Requested for Connection")
    }

    process.exit(0)
});

Run the index.js file using the following command:

node index.js

Output:

Not Requested for Connection

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