docs: def respond(self, obj):
          """Gives a response JSON(P) message"""
  
          # Get the callback argument if JSONP is allowed
          callback = self.get_argument("callback", None) if oz.settings["allow_jsonp"] else None
  
          # We're pretty strict with what callback names are allowed, just in case
          if callback and not CALLBACK_VALIDATOR.match(callback):
              raise oz.json_api.ApiError("Invalid callback identifier - only functions with ASCII characters are allowed")
  
          # Provide the response in a different manner depending on whether a
          # JSONP callback is specified
          json = escape.json_encode(obj)
  
          if callback:
              self.set_header("Content-Type", "application/javascript; charset=UTF-8")
              self.finish("%s(%s)" % (callback, json))
          else:
              self.set_header("Content-Type", "application/json; charset=UTF-8")
              self.finish(json)