How to use HTTP/2 in Node.js? | Node.js Interview Questions

What You'll Learn

HTTP/2 features
Creating HTTP/2 servers
HTTP/2 clients

HTTP/2 Server

code.jsJavaScript

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

const server = http2.createSecureServer({
  key: fs.readFileSync('key.pem'),
  cert: fs.readFileSync('cert.pem')
});

server.on('stream', (stream, headers) => {
  stream.respond({
    ':status': 200,
    'content-type': 'text/html'
  });
  stream.end('<h1>Hello HTTP/2!</h1>');
});

server.listen(8443);

Server Push

code.jsJavaScript

server.on('stream', (stream, headers) => {
  const path = headers[':path'];

  if (path === '/') {
    // Push CSS before it's requested
    stream.pushStream({ ':path': '/style.css' }, (err, pushStream) => {
      pushStream.respond({ ':status': 200, 'content-type': 'text/css' });
      pushStream.end('body { color: blue; }');
    });

    stream.respond({ ':status': 200, 'content-type': 'text/html' });
    stream.end(`
      <html>
        <link rel="stylesheet" href="/style.css">
        <body>Hello!</body>
      </html>
    `);
  }
});

HTTP/2 Client

code.jsJavaScript

const http2 = require('http2');

const client = http2.connect('https://localhost:8443', {
  rejectUnauthorized: false
});

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

req.on('response', (headers) => {
  console.log('Status:', headers[':status']);
});

let data = '';
req.on('data', chunk => data += chunk);
req.on('end', () => {
  console.log(data);
  client.close();
});