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    Expires on:2024-01-01

Details：Addtime:2023-04-03
TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list. // Werkzeug Debugger

TypeError

TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.

Traceback (most recent call last)

  • File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2095, 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 "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2080, 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 "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 2077, in wsgi_app

            ctx = self.request_context(environ)
            error: t.Optional[BaseException] = 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 "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1526, 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: t.Union[ResponseReturnValue, HTTPException],
            from_error_handler: bool = False,

  • File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1545, 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, response=response)
            except Exception:
                if not from_error_handler:

  • File "C:\ProgramData\Miniconda3\lib\site-packages\flask\app.py", line 1734, in make_response

                            " response. The return type must be a string,"
                            " dict, tuple, Response instance, or WSGI"
                            f" callable, but it was a {type(rv).__name__}."
                        ).with_traceback(sys.exc_info()[2]) from None
                else:
                    raise TypeError(
                        "The view function did not return a valid"
                        " response. The return type must be a string,"
                        " dict, tuple, Response instance, or WSGI"
                        f" callable, but it was a {type(rv).__name__}."
                    )
TypeError: The view function did not return a valid response. The return type must be a string, dict, tuple, Response instance, or WSGI callable, but it was a list.

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Description
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