docs: def add_handlers(self, room_handler=None, transaction_handler=None,
                       user_handler=None):
          """Adds routes to Application that use specified handlers."""
          # Add all the normal matrix API routes
          if room_handler:
              room = resources.Room(room_handler,
                                    self.Api)
              self.add_route("/rooms/{room_alias}", room)
          if transaction_handler:
              transaction = resources.Transaction(transaction_handler,
                                                  self.Api)
              self.add_route("/transactions/{txn_id}", transaction)
          if user_handler:
              user = resources.User(user_handler,
                                    self.Api)
              self.add_route("/users/{user_id}", user)