Node.js http.ServerResponse.writeProcessing() Method

The httpServerResponse.writeProcessing() is an inbuilt application programming interface of class ServerResponse within the HTTP module which is used to send an HTTP/1.1 102 Processing message to the client.

Syntax:

response.writeProcessing()

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

Return Value: This method has nothing to return.

Example 1: Filename-index.js

Javascript

// Node.js program to demonstrate the
// response.writeProcessing() 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) {

        // Sending a HTTP/1.1 102 Processing message
        // by using writeProcessing method
        response.writeProcessing();

        // Display result
        // by using end() method
        response.end("HTTP/1.1 102 Processing message"
            + " has been sent", '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:

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:

HTTP/1.1 102 Processing message has been sent

Example 2: Filename-index.js

Javascript

// Node.js program to demonstrate the
// response.writeProcessing() method

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

// Request and response handler
const http2Handlers = (request, response) => {

    // Sending a HTTP/1.1 102 Processing message
    // by using writeProcessing method
    response.writeProcessing();

    // Display result
    // by using end() method
    response.end("HTTP/1.1 102 Processing message"
        + " has been sent", '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...
displaying the result...
server is closed

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

HTTP/1.1 102 Processing message has been sent

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