Example from our ServerTime demo of a simple Python AppEngine handler that returns JSON

simple_json_get_handler.py

import json
import webapp2

class ServerTime(webapp2.RequestHandler):
  def get(self):
    self.response.headers["Content-Type"] = "application/json"
    #self.response.headers.add_header("Access-Control-Allow-Origin", "*")

    response = {"message": "Hello AJAX!"}
      
    self.response.out.write(json.dumps(response))