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Node.js http.IncomingMessage.trailers Method
  • Last Updated : 23 Dec, 2020

The http.IncomingMessage.trailers is an inbuilt application programming interface of class Incoming Message within http module which is used to get the request/response trailers object.

Syntax:

request.trailers or response.trailers

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

Return Value: This method returns the request or response trailers object.

Example 1: Filename: index.js



Javascript




// Node.js program to demonstrate the  
// request.trailers 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){ 
  
  // Getting trailers 
  // by using request.trailers Api
  const value = request.trailers;
  
  // Display the request trailers
  console.log(value)
    
  // Display the result
  response.end(  "hello world", '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..."); 
});

Execution 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 localhost address http://localhost:3000/. In the search bar of the browser.

Example 2: Filename: index.js

Javascript




// Node.js program to demonstrate the  
// request.trailers APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  // Getting trailers 
  // by using request.trailers Api
  const value = request.trailers;
  
  // Display the request trailer
  console.log(value)
    
  // Display result
  response.end( "GeeksForGeeks", 'utf8', () => { 
      console.log("displaying the result..."); 
  
 //Closing the server
      httpServer.close(()=>{
          console.log("server is closed")
      })
  });
  }; 
    
// Creating http Server and listening
// on the 3000 port
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => { 
    console.log("Server is running at port 3000..."); 
});

Execution Command:

node index.js

Console Output:

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

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

GeeksForGeeks

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




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