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Node.js http.ServerResponse.writableEnded Property

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  • Last Updated : 18 Jan, 2021
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The httpServerResponse.writableEnded is an inbuilt application programming interface of class Server Response within http module which is used to check if response.end() has been called or not.

Syntax:

response.writableEnded

Parameters: This method does not accept any parameter.

Return Value: This method returns true if and only if response.end() has been called otherwise false.

Example 1: Filename: index.js

Javascript




// Node.js program to demonstrate the  
// response.writableEnded APi
    
// 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){ 
  
  // Checking if the response.end has 
  // been called or not by using 
  // writableEnded API
  const value = response.writableEnded;
  
    
  // Display result
  // by using end() api
  response.end( "response.end() has been called : "
      + value, 'utf8', () => { 
      console.log("displaying the result..."); 
  
      // Closing the server
      httpServer.close(()=>{
          console.log("server is closed")
      })
  }); 
}); 
    
// Listening to http Server 
httpServer.listen(PORT, () => { 
    console.log("Server is running at port 3000..."); 
});

Run index.js file using below command:

node index.js

Console output:

Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

Browser Output: Paste the local host address http://localhost:3000/. In the search bar of the browser.

Output:

response.end() has been called : false

Example 2: Filename: index.js

Javascript




// Node.js program to demonstrate the  
// response.writableEnded APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  // Checking if the response.end has
  // been called or not by using 
  // writableEnded API
  const value = response.writableEnded;
    
  if(value)
    response.write(
"<h1>Response.end() has been called<h1>")
  else
    response.write(
"<h1>Response.end() has been not called<h1>")
  
  // Ending the response
  response.end()
}; 
    
// Creating http Server 
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => { 
    console.log("Server is running at port 3000..."); 
});

Run index.js file using below command:

node index.js

Console Output:

Server is running at port 3000...

Browser Output: Paste the localhost address http://localhost:3000/. In the search bar of the browser.

Output:

Response.end() has been not called

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


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