Node.js http.ClientRequest.writableFinished API

The http.ClientRequest.writableFinished is an inbuilt application programming interface of class ClientRequest within http module which is used to check if all the data has been flushed or not.

Syntax:

const request.writableEnded

Parameters: This API does not accept any argument as parameter.

Return Value : This method returns true if and only if all the data has been flushed.

Example 1:

index.js

// NodeJS program to demonstrate the
// request.writableFinished APi

// 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);

  // checking if the all data has been flushed
  // by using writableFinished api
  if(req.writableFinished)
  console.log('all data has been flushed')
  else
  console.log('all data has not been flushed')

  process.exit(0)
});

Output: