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Node.js http.IncomingMessage.rawTrailers Method
  • Last Updated : 20 Dec, 2020

The http.IncomingMessage.rawTrailers is an inbuilt application programming interface of class IncomingMessage within HTTP module which is used to get the raw request/response trailer keys and values exactly as they were received.

Syntax:

const message.rawTrailers

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

Return Value: This method returns the raw request/response trailer keys and values exactly as they were received.

Example 1: Filename: index.js



Javascript




// Node.js program to demonstrate the  
// request.rawTrailers method
  
// 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 rawTrailers by using
  // request.rawTrailers method
  const value = request.rawTrailers
  console.log(value)
  
  // Display result
  response.end("rawTrailers", value, '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 go to http://localhost:3000/ in the browser, you will see the following output:

rawTrailers  

Example 2: Filename: index.js

Javascript




// Node.js program to demonstrate the  
// request.rawTrailers method
  
// Importing http module 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
  // Getting rawTrailers 
  // by using request.rawTrailers method
  const value = request.rawTrailers;
   
  if(!value) console.log('No rawTrailers added')
  
  // Display result
  response.end("rawTrailers" + value, 'utf8', () => {
    console.log("displaying the result...");
  
    httpServer.close(() => {
      console.log("server is closed")
    })
  });
};
  
// Creating http Server 
var 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...
No rawTrailers added
displaying the result...
server is closed

Now go to http://localhost:3000/ in the browser, you will see the following output:

rawTrailers 

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




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