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Node.js http.ClientRequest.setSocketKeepAlive() Method
  • Last Updated : 12 Apr, 2021

The http.ClientRequest.setSocketKeepAlive() is an inbuilt application programming interface of class ClientRequest within the HTTP module which is used to enable/disable the TCP/IP socket keep alive.

Syntax:

const request.setSocketKeepAlive([enable][, initialDelay])

Parameters: This method takes the following two parameters:

  • enable: It is the boolean value that tells whether to keep the socket alive or not.
  • initialDelay: It is an optional parameter, is the delay value in milliseconds.

Return Value: This method has nothing to return.

Example 1: Filename-index.js



Javascript




// Node.js program to demonstrate the 
// request.setSocketKeepAlive() 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.host = '127.0.0.1'
 
    // Setting the keep alive for the socket
    // by using setSocketKeepAlive method
    req.setSocketKeepAlive(true);
 
    // Display the result
    console.log("keep alive is enabled for the socket")
 
    process.exit(0)
});

Run the index.js file using the following command:

node index.js

Output:

keep alive is enabled for the socket

Example 2: Filename-index.js

Javascript




// Node.js program to demonstrate the 
// request.setSocketKeepAlive() 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',
    });
 
    // Setting the keep alive for the socket
    // by using setSocketKeepAlive method
    req.setSocketKeepAlive(true);
 
    // Display the result
    console.log("keep alive is enabled for the socket")
 
    process.exit(0)
});

Run the index.js file using the following command:

node index.js

Output:

keep alive is enabled for the socket

Reference:

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




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