Node.js http2.connect() Method - GeeksforGeeks

18 Nov, 2020
The http2.connect() is an inbuilt application programming interface of class http2 within the http2 module which is used to return a ClientHttp2Session instance.
Syntax:
const http2.connect(authority[, options][, listener])

Parameters: This method takes the following argument as a parameter:
authority: It is the URL representing a remote HTTP/2 server to connect to.
options: It can be maxDeflateDynamicTableSize, maxSettings, maxSessionMemory, etc option can be used according to need.
listener: It is the one time listener of the ‘connect’ event.
Return Value: This method returns the object of the ClientHttp2Session instance.
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// http2.connect() method  const http2 = require('http2');const fs = require('fs');  // Private key and public certificate for accessconst options = {  key: fs.readFileSync('private-key.pem'),  cert: fs.readFileSync('public-cert.pem'),};  // Creating and initializing server// by using http2.createServer() methodconst server = http2.createServer(options);  server.on('stream', (stream, requestHeaders) => {  stream.respond({     ':status': 200,     'content-type': 'text/plain'   });    stream.write('hello ');  stream.end('world');      // Stopping the server  // by using the close() method  server.close(() => {    console.log("server closed");  })});  server.listen(8000);  // Creating and initializing client// by using http2.connect() methodconst client = http2.connect(    'http://localhost:8000');  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 closed");  })});
Run the index.js file using the following command:
node index.js
Output:
status : 200
Received: hello
Received: world
client closed
server closed

Example 2: Filename: index.js
Javascript
// Node.js program to demonstrate the// http2.connect() method  const http2 = require('http2');const fs = require('fs');  // Private key and public certificate for accessconst options = {  key: fs.readFileSync('private-key.pem'),  cert: fs.readFileSync('public-cert.pem'),};  // Creating and initializing server// by using http2.createServer() methodconst server = http2.createServer(options);  server.on('stream', (stream, requestHeaders) => {  stream.end('world');      // Stopping the server  // by using the close() method  server.close(() => {    console.log("server closed");  })});  server.listen(8000);  // Creating and initializing client// by using http2.connect() methodconst 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 closed");  })});
Run the index.js file using the following command:
node index.js
Output:
Received: world
client closed
server closed

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2_connect_authority_options_listener
Node.js-Methods
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