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Node.js Http2Session Close Event
  • Last Updated : 18 Nov, 2020

The ‘close’ Event in the http2 server is emitted when the Http2Session has been destroyed.

Syntax:

Event: 'close'

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

Return Value: This event returns nothing but a callback function.

How to generate a Private key and Public certificate?



1. Filename: Private key Open notepad and copy-paste the following key and save the file as private-key.pem

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

2. Filename: Public certificate Open notepad and copy-paste the following key and save the file as public-cert.pem

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

Example 1: Filename: index.js

Javascript




// Node.js program to demonstrate the
// close event 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.respond({ 
    ':status': 200, 
    'content-type': 'text/plain' 
  });
  
  stream.write('hello ');
  
  // Getting session object
  // by using session method
  const http2session = stream.session;
  
  // Getting alpnProtocol of this session
  // by using alpnProtocol method
  const alpnProtocol = http2session.alpnProtocol;
  
  stream.end("session protocol : " + alpnProtocol);
  
  http2session.close();
  
  // Handling 'close' event
  http2session.on('close',() => {
    console.log("session is closed");
  })
  
  // 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(
  
const req = client.request({ 
  ':method': 'GET', ':path': '/' });
  
req.on('response', (responseHeaders) => {
  console.log("status : " 
  + responseHeaders[":status"]);
});
  
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:

server destroyed
session is closed
status : 200
Received: hello
Received: session protocol : h2c

Example 2: Filename: index.js

Javascript




// Node.js program to demonstrate the
// close event 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 session object
  // by using session method
  const http2session = stream.session;
  
  // Getting alpnProtocol of this session
  // by using alpnProtocol method
  const alpnProtocol = http2session.alpnProtocol;
  
  stream.end("session protocol : " + alpnProtocol);
  
  http2session.close();
  
  // Handling 'close' event
  http2session.on('close', () => {
    console.log("session is closed");
  })
  
  // 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(
  
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:

server destroyed
session is closed
Received: session protocol : h2c

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_event_close




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