• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 1478, in __call__

      def __call__(self, environ: dict, start_response: t.Callable) -> t.Any:

          """The WSGI server calls the Flask application object as the

          WSGI application. This calls :meth:`wsgi_app`, which can be

          wrapped to apply middleware.

          """

          return self.wsgi_app(environ, start_response)

• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 1458, in wsgi_app

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

                  raise

              return response(environ, start_response)

          finally:

• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 1455, in wsgi_app

          ctx = self.request_context(environ)

          error: BaseException | None = None

          try:

              try:

                  ctx.push()

                  response = self.full_dispatch_request()

              except Exception as e:

                  error = e

                  response = self.handle_exception(e)

              except:  # noqa: B001

                  error = sys.exc_info()[1]

• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 870, in full_dispatch_request

              rv = self.preprocess_request()

              if rv is None:

                  rv = self.dispatch_request()

          except Exception as e:

              rv = self.handle_user_exception(e)

          return self.finalize_request(rv)

      def finalize_request(

          self,

          rv: ft.ResponseReturnValue | HTTPException,

          from_error_handler: bool = False,

• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 889, in finalize_request

          with the `from_error_handler` flag.  If enabled, failures in

          response processing will be logged and otherwise ignored.

          :internal:

          """

          response = self.make_response(rv)

          try:

              response = self.process_response(response)

              request_finished.send(

                  self, _async_wrapper=self.ensure_sync, response=response

              )

• File "D:appminiconda3envscrawllibsite-packagesflaskapp.py", line 1161, in make_response

                      " (body, status), or (body, headers)."

                  )

          # the body must not be None

          if rv is None:

              raise TypeError(

                  f"The view function for {request.endpoint!r} did not"

                  " return a valid response. The function either returned"

                  " None or ended without a return statement."

              )

TypeError: The view function for 'rewrite_text_api' did not return a valid response. The function either returned None or ended without a return statement.