a minimal gae app

app.yaml

version: 1
runtime: python27
api_version: 1
threadsafe: true
application: <YOUR_APP_ID_HERE>

handlers:
- url: /.*
  script: main.application

manual_scaling:
  instances: 1

main.py

import logging
import webapp2

class MainPage(webapp2.RequestHandler):
    def get(self):
        logging.info("Hello!")
        self.response.headers['Content-Type'] = 'text/html'
        self.response.write('<h1>Done</h1>')

routes = [
    ('/', MainPage),
]
application = webapp2.WSGIApplication(routes, debug=True)