app.py

# 	Copyright 2016, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#    http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import webapp2
from paste import httpserver

class reverse(webapp2.RequestHandler):
    def get(self):
         self.response.write(self.request.GET['str'][::-1] if 'str' in self.request.GET else '')

httpserver.serve(webapp2.WSGIApplication([('/', reverse)]), host='0.0.0.0', port='80')