text: from py4web.core import Fixture, request, response, HTTP
  
  class CORS(Fixture):
      """
      Fixture helper for sharing web service avoiding cross origin resource sharing problems
      """
  
      def __init__(self,
                   age=86400,
                   origin="*",
                   headers="*",
                   methods="*"):
          Fixture.__init__(self)
  
          self.age = age
          self.origin = origin
          self.headers = headers
          self.methods = methods
  
      def on_request(self):
          response.headers["Access-Control-Allow-Origin"] = self.origin
          response.headers["Access-Control-Max-Age"] = self.age
          response.headers["Access-Control-Allow-Headers"] = self.headers
          response.headers["Access-Control-Allow-Methods"] = self.methods
          response.headers["Access-Control-Allow-Credentials"] = "true"
          if request.method == "OPTIONS":
              raise HTTP(200)
  