Node.js http.IncomingMessage.trailers Method

The http.IncomingMessage.trailers is an inbuilt application programming interface of the class Incoming Message within http module which is used to get the request/response trailers to 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
const http = require('http');

// Setting up PORT
const PORT = process.env.PORT || 3000;

// Creating http Server
const 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...");
});

Steps to run:

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
const 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
const httpServer = http.createServer(
    http2Handlers).listen(3000, () => {
        console.log("Server is running at port 3000...");
    });

Steps to run:

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