Node.js http2stream.sentInfoHeaders Method

The http2stream.sentInfoHeaders is an inbuilt application programming interface of class Http2Stream within http2 module which is used to get an object containing the outbound informational (additional) headers sent to this Http2Stream.

Syntax:

http2stream.sentInfoHeaders

Parameters: This method does not accept any parameter.

Return Value: This method returns an object containing the outbound informational (additional) headers sent to this Http2Stream.

How to generate private key and public certificate?

1. Private key: Open notepad and copy paste the following key as shown below: 
   

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

1. Now save the file as private-key.pem
   
2. Public certificate: Open notepad and copy paste the following key: 
   

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

1. Now save the as public-cert.pem
   

Example 1: Filename: index.js

javascript

// Node.js program to demonstrate the
// Http2Stream.sentInfoHeaders method

const http2 = require('http2');
const fs = require('fs');

// Private key and public certificate for access
const options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('public-cert.pem'),
};

// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options);

server.on('stream', (stream, requestHeaders) => {

   stream.additionalHeaders({
      ':status': 100,
      'content-type': 'text/plain'
   });

   // Getting rst stream code
   // by using sentInfoHeaders api
   const status = stream.sentInfoHeaders;

   console.log(status)

   stream.end("the end");

   // Stopping the server
   // by using the close() method
   server.close(() => {
     console.log("server destroyed");
   })
});

server.listen(8000);

// Creating and initializing client
// by using tls.connect() method
const client = http2.connect('http://localhost:8000');

const req = client.request({
   ':method': 'GET', ':path': '/'
});

req.on('data', (data) => {
  console.log('Received: %s ',
  data.toString().replace(/(\n)/gm, ""));
});

req.on('end', () => {
  client.close(() => {
    console.log("client destroyed");
  })
});

Run the index.js file using the following command:

node index.js

Output:

[
  [Object: null prototype] {
    ':status': 100,
    'content-type': 'text/plain'
  }
]
Received: the end 
client destroyed
server destroyed

Example 2: Filename: index.js

Javascript

// Node.js program to demonstrate the
// Http2Stream.sentInfoHeaders method

const http2 = require('http2');
const fs = require('fs');

// Private key and public certificate for access
const options = {
   key : fs.readFileSync('private-key.pem'),
   cert : fs.readFileSync('public-cert.pem'),
};

// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options);

server.on('stream', (stream, requestHeaders) => {

    // Getting rst stream code
    // by using sentInfoHeaders api
    const status = stream.sentInfoHeaders;

    stream.end("header object: " + status);

    // Stopping the server
    // by using the close() method
    server.close(() => {
       console.log("server destroyed");
    })
});

server.listen(8000);

// Creating and initializing client
// by using tls.connect() method
const client = http2
    .connect('http:// localhost:8000');

const req = client.request({
    ':method' : 'GET', ':path' : '/'
});

req.on('data', (data) => {
    console.log('Received: %s ',
    data.toString().replace(/ (\n) / gm, ""));
});

req.on('end', () => {
  client.close(() => {
     console.log("client destroyed");
  })
});

Run the index.js file using the following command:

node index.js

Output:

Received: header object: undefined
client destroyed
server destroyed

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2stream_additionalheaders_headers