How to download given url or html as pdf ?

[collegeimprovements]

I was trying to download the given url as pdf, but not able to do so with lightpanda.
Is there any recommended way to generate or download pdf with lightpanda ? Can we set header and footer of pdf as well somehow ?
Here is the code generated with ai:

// Get URL from command line arguments
const url = process.argv[2];

if (!url) {
  console.error('Please provide a URL as an argument');
  console.error('Usage: bun generate-pdf-minimal.js <url>');
  process.exit(1);
}

async function generatePDF() {
  try {
    console.log('Creating WebSocket connection to Lightpanda...');
    
    const WebSocket = (await import('ws')).default;
    const ws = new WebSocket('ws://0.0.0.0:9222/');
    
    let messageId = 1;
    const pending = new Map();
    
    // Helper to send CDP commands
    const send = (method, params = {}) => {
      return new Promise((resolve, reject) => {
        const id = messageId++;
        pending.set(id, { resolve, reject });
        ws.send(JSON.stringify({ id, method, params }));
      });
    };
    
    ws.on('message', (data) => {
      const message = JSON.parse(data);
      if (message.id && pending.has(message.id)) {
        const { resolve, reject } = pending.get(message.id);
        pending.delete(message.id);
        if (message.error) {
          reject(new Error(message.error.message));
        } else {
          resolve(message.result);
        }
      }
    });
    
    await new Promise((resolve) => ws.on('open', resolve));
    console.log('Connected!');
    
    // Create a new target (tab)
    console.log('Creating new tab...');
    const { targetId } = await send('Target.createTarget', { url: 'about:blank' });
    
    // Attach to the target
    const { sessionId } = await send('Target.attachToTarget', {
      targetId,
      flatten: true
    });
    
    // Helper to send commands to the page session
    const pageCommand = (method, params = {}) => {
      return send('Target.sendMessageToTarget', {
        sessionId,
        message: JSON.stringify({ id: messageId++, method, params })
      });
    };
    
    // Enable Page domain
    await pageCommand('Page.enable');
    
    console.log(`Navigating to ${url}...`);
    await pageCommand('Page.navigate', { url });
    
    // Wait for load
    await new Promise(resolve => setTimeout(resolve, 5000));
    
    console.log('Generating PDF...');
    const pdfResult = await pageCommand('Page.printToPDF', {
      format: 'A4',
      printBackground: true
    });
    
    // The result is nested in the response
    const pdfData = JSON.parse(pdfResult).result.data;
    
    // Save PDF
    const fs = await import('fs/promises');
    const path = await import('path');
    const timestamp = Date.now();
    const pdfFileName = `output-${timestamp}.pdf`;
    const fullPath = path.resolve(process.cwd(), pdfFileName);
    
    const pdfBuffer = Buffer.from(pdfData, 'base64');
    await fs.writeFile(fullPath, pdfBuffer);
    
    console.log(`\n✅ PDF saved successfully!`);
    console.log(`   Path: ${fullPath}`);
    console.log(`   Size: ${(pdfBuffer.length / 1024).toFixed(2)} KB`);
    
    ws.close();
    
  } catch (error) {
    console.error('Error:', error);
    process.exit(1);
  }
}

generatePDF();

[collegeimprovements]

Closing after seeing: #941 (comment)