Check for errors using request.get()

I’ve got some apps deployed on I’d love to be able to write a monitor, that will let me know when the apps crash. Is there a way to tell if an app is running using the http response?

For example, if I use the python:

response = requests.get('')

or similar, is there something in the response that can distinguish a running app from an error message? Any other hints would be welcome.

Thank you for your help!