How to fix Error: HTTP/2 invalid settings frame (malformed settings) in Node.js

# On Linux/macOS
NODE_DEBUG=http2 node your-app.js

# On Windows (PowerShell)
$env:NODE_DEBUG='http2'
node your-app.js

# Using curl to test HTTP/2 server
curl -I --http2 https://example.com/

# Using h2spec to validate HTTP/2 compliance
go install github.com/summerwind/h2spec/v2@latest
h2spec -port 443 -tls example.com

# Try connecting directly to the origin IP (if accessible)
dig +short example.com  # Get the IP
curl -I --http2 --connect-to example.com:443:x.x.x.x:443 https://example.com/

# Or bypass proxies by connecting to the host directly
telnet example.com 443

# Check current version
node --version

# Update to the latest stable version (using nvm)
nvm install --latest-npm node
nvm use node

# Or update manually from https://nodejs.org/

const http2 = require('http2');

// Create HTTP/2 session with explicit settings
const session = http2.connect('https://example.com/', {
  settings: {
    headerTableSize: 4096,
    enablePush: false,
    initialWindowSize: 65535,
    maxFrameSize: 16384,  // Use minimum allowed value
    maxConcurrentStreams: 100,
    maxHeaderListSize: 8192
  }
});

session.on('error', (err) => {
  console.error('Session error:', err.message);
});

session.on('remoteSettings', (settings) => {
  console.log('Received settings from server:', settings);
});

const http2 = require('http2');

async function makeRequest() {
  return new Promise((resolve, reject) => {
    const session = http2.connect('https://example.com/');

    session.once('error', (err) => {
      console.error('HTTP/2 error:', err.message);

      // If it's a settings frame error, log details
      if (err.message.includes('settings frame')) {
        console.error('Server sent invalid HTTP/2 settings');
        console.error('Consider contacting the API provider');
      }

      reject(err);
    });

    const req = session.request({ ':path': '/api/data' });

    req.on('response', (headers) => {
      resolve(headers);
      session.close();
    });

    req.end();
  });
}

makeRequest().catch(err => {
  console.error('Request failed:', err.message);
});

I'm getting "HTTP/2 invalid settings frame (malformed settings)" when connecting
from Node.js v{version}. The connection fails immediately during the settings
negotiation phase. Testing with h2spec shows [list issues found]. Can you review
your HTTP/2 settings frame implementation against RFC 7540?