Django view doesn't work at all after setting debug=False

Using Django Deployment
1

I am stuck in this problem for a whole day and the irrationality of this problem is wretching.

# urls.py
path('check_progress/<str:task_id>/', views_data.check_progress, name='check_progress'),

#views.py
def check_progress(request, task_id):
    logger.info(f"Entered check_progress with task_id: {task_id}")

    try: 
      task = AsyncResult(task_id)
      data = {'state': task.state, 'percent': 0}

      if task.state == 'PROGRESS':
        task_info = task.info or {} # from self.update_state(state='PROGRESS', meta=TASK_INFO)
        data['percent'] = task_info.get('percent', 0)
    
      elif task.state == 'SUCCESS':
        data['percent'] = 100

      return JsonResponse(data)
  
    except Exception as e:
      logger.error(f"check_progress() failed. {e}")

When DEBUG = True

2024-01-24 01:24:42 [2024-01-23 17:24:42 +0000] [7] [DEBUG] GET /check_progress/abcg/
2024-01-24 01:24:42 2024-01-23 17:24:42,116:INFO - Entered check_progress with task_id: abcg

When DEBUG = False

[DEBUG] GET /check_progress/
2024-01-24 01:25:23 Internal Server Error: /check_progress/
2024-01-24 01:25:23 2024-01-23 17:25:23,980:ERROR - Internal Server Error: /check_progress/
2024-01-24 01:25:30 [2024-01-23 17:25:30 +0000] [7] [DEBUG] GET /check_progress/erergg
2024-01-24 01:25:30 Internal Server Error: /check_progress/erergg
2024-01-24 01:25:30 2024-01-23 17:25:30,964:ERROR - Internal Server Error: /check_progress/erergg

The debug settings is the only cause of problem. The weird thing is that this is the only endpoint with issue. Other endpoints dont have the same problem.

I cant even execute the first line of the view function. The view itself is broken.

2

You’re not passing the parameter in the second example. The get shows that you’re attempting to access a url named /check_progress, which doesn’t match anything you’re showing in your urls.py.

3

I copied the wrong log. But even after passing a parameter, it doesnt work.

4

Your GET still doesn’t match the URL. The url is defined with a trailing slash, but your GET doesn’t show that slash as being present.

With debug = True, there should be a complete stacktrace printed in your server’s log. (How are you running your application? Which server are you using?)

Also, your title isn’t consistent with the post - when is the error occurring? When DEBUG = True or DEBUG = False? Your title says that the view isn’t working when DEBUG = False, but you’ve labeled your logs such that the error occurs when DEBUG = True.

5

It’s the trailing slash. Apparently, when debug is set to True, the trailing slash automatically appends. When debug is set to False, somehow it doesn’t.

6

Note the trailing slash is present here in the request. Django isn’t appending it, unless you see the previous request being a redirect.

Also see Settings | Django documentation | Django