Raising ValidationError causes 500 Internal Server Error response

Using Django Mystery Errors
1

Here’s a simplified example. I have a views.py with:

# Obviously, this is used as a handler for a route in urls.py
def handle_foo(request: HttpRequest, **kwargs: dict[str, Any]) -> HttpResponse:
  txt = do_something(json.loads(request.body.decode('utf-8'))['field_i_want'])
  return JsonResponse({'ok': txt})

And I have do_something defined as:

def do_something(value: str):
  if value == 'bad': raise ValidationError('bad value')
  return f'good value: {value}'

Now I expect this to respond with a 400 Bad Request, but it responds with 500 Internal Server Error. And the traceback points to this function in Django Core: django/django/core/handlers/exception.py at ecd3071dac9bc32028849b1563dc30e49744950e · django/django · GitHub

It seems like this function is supposed to handle Django exceptions, so I’m wondering why it doesn’t handle the ValidationError?

2

Please post the complete error with the traceback message.