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Node.js clienthttp2session.request() Method

  • Last Updated : 17 Jun, 2021

The clienthttp2session.request() is an inbuilt application programming interface of class ClientHttp2Session within http2 module which is used to return the object of ClientHttp2Stream.

Syntax:

const clienthttp2session.request(headers[, options])

Parameters: This method takes the following argument as a parameter.

  • header: Header object.
  • options: It takes the any of the arguments {endStream, exclusive, parent, weight, waitForTrailers}

Return Value: This method returns the object of ClientHttp2Stream.

How to generate private key and public certificate?



Private key:

Step — 1: Open notepad and copy and paste the following key.

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

Step — 2: Save as private-key.pem

Public certificate

Step — 1: Open notepad and copy and paste the following key

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

Step — 2: Save as public-cert.pem

Example 1: Filename: index.js

Javascript




// Node.js program to demonstrate the
// clienthttp2session.request() 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('session', (session) => {
 
  // Set origin frame
  session.origin('http://localhost:8000');
  console.log("ORIGIN frame is submitted")
});
 
 
server.on('stream', (stream, requestHeaders) => {
 
  // Setting response header to client
  // by using respond() method
  stream.respond({
    ':status': 200,
    'content-type': 'text/plain'
  });
   
  stream.write('hello ');
 
   // Checking if header is sent or not
   // by using pushAllowed method
   const status = stream.pushAllowed;
 
   if(status)
     stream.end("push stream is accepted");
   else
     stream.end("push stream is not accepted");
 
  // Stoping 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(
 
 
// Getting object of ClientHttp2Stream
// by using request() method
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");
  })
});

 
 

Output:



 

ORIGIN frame is submitted
status : 200
Received: hello
Received: push stream is accepted
client destroyed
server destroyed

 

Run the index.js file using the following command:

 

node index.js

 

Example 2: Filename: index.js

 

Javascript




// Node.js program to demonstrate the
// clienthttp2session.request() 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) => {
 
  // Setting response header to client
  // by using respond() method
  stream.respond({
    ':status': 200,
    'content-type': 'text/plain'
  });
   
  stream.write('hello ');
 
  const session = stream.session;
 
  // Set origin frame
  session.origin('http://localhost:8000');
  stream.end("ORIGIN frame is submitted")
 
  // Stoping 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(
 
// Getting object of ClientHttp2Stream
// by using request() method
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");
  })
});

 
 

Output:



 

status : 200
Received: hello
Received: ORIGIN frame is submitted
client destroyed
server destroyed

 

Run the index.js file using the following command:

 

node index.js

 

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_clienthttp2session_request_headers_options

 




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