text: import webapp2
  from google.appengine.ext import db
  from SetHandler import SetHandler
  
  class UnsetHandler(webapp2.RequestHandler):
      @db.transactional
      def get(self):
          name = self.request.get('name')
  
          SetHandler().set_value(name, None)
  
          self.response.headers['Content-Type'] = 'text/plain'