Hack 81. Use Node.js’s Response Object to Respond to the Client with Device-Specific Data

You can use the response object in Node.js to display client-specific information in the browser.

Now that we have hacked our request object, let’s tackle the response. We can begin by calling the writeHead() method and passing the success response code, along with the Content-Type set to text/plain. This is a pretty standard response. Then we will call the end() method and pass it a specific string based on the properties we added to our global DeviceData object.

res.writeHead(200, {'Content-Type': 'text/plain'});

  if (DeviceData.mobile) {
    res.end('Hello Html5\n Request from a Mobile Device');
  }

  if (DeviceData