Hello! 

I maintain a Django app hosted on Heroku. We use DRF intensively to serve 
our FE app. 
Django version: 2.2.21.

We have an endpoint that works perfectly well 99% of the time, but 
sometimes, it timeouts.

We use Sentry to monitor and you can find the traces here 
<https://sentry.io/share/issue/791a44ef15404e36a1f52332b4217a90/>.

FYI but maybe it is not useful, this endpoint:

   - Has very little processing then starts a background task.
   - In the breadcrumb of Sentry, we can see that the REDIS *LPUSH *command 
   is triggered at the very end of the 20s heroku timeout.

It seems to me that the function calls is going back and forth between 

   - django/core/handlers/exception.py in inner at line 34
   - django/utils/deprecation.py in __call__ at line 94
   
This has been happening for months now and we still do not have a solution. 

Any idea as to why this might happen?
And why only in certain cases?

Thank you very much for the help!

Robin Bonnin

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