Node.js http.IncomingMessage.rawTrailers Method

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
const http = require('http');

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

// Creating http Server
const 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, and 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
const 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
const 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, and you will see the following output:

rawTrailers 

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