From https://github.com/MarkEdmondson1234/ga-get-to-post/blob/master/main.py and blogpost http://markedmondson.me/e-mail-open-rate-tracking-with-google-analytics-measurement-protocol-demo

homepage.py

class MainPage(webapp2.RequestHandler):
  """Get a URL, POST a GA hit"""
  def get(self):
    template_values = {}
    template = JINJA_ENVIRONMENT.get_template('main.html')
    self.response.write(template.render(template_values))