Handle GET requests

server.js

// View latest image
app.get('/', (req, res) => {
  // Does this session have an image yet?
  if(!latestPhoto) {
    return res.status(404).send("Nothing here yet");
  }

  console.log('sending photo');

  try {
    // Send the image
    var img = Buffer.from(latestPhoto, 'base64');
    res.writeHead(200, {
      'Content-Type': 'image/png',
      'Content-Length': img.length
    });
    res.end(img);
  } catch(e) {
    // Log the error and stay alive
    console.log(e);
    return res.sendStatus(500);
  }
});