Re: how does Django handle outbound requests?

On Fri, 25 Jun 2021 14:41:52 -0700 (PDT)
Glenn Rutkowski <glenn@caffeinelab.com> wrote:

> Can anyone point me in the right direction? We are using Django as an API
> Endpoint that accepts a request and then repackages it and sends it to an
> external service and waits for a response. I'm interested in the external
> call and how it is handled. If it times out or takes forever, what it the
> effect on the Django server? Am I blocking any other execution from
> happening while waiting for the response?
>
> From what I have read it seems as if the best idea is to pass the job off
> to a queue and then check for job status alerts or updates. If I have to
> rethink this - I'd rather do it now.
>
> Thanks for reading, looking forward to responses!
>
> -g

In my setup(s) I often have:

web -> nginx -> uwsgi -> django -> backend api

Any of these can time out.
I use the requests library for calls to the backend api,
if this times out it throws a exception which if unhandled gets passed up the chain as a 500 error.

While the backend request is running, django blocks,
but uwsgi has multiple django instances started so other requests can be handled.

If I'd use a queue depends strongly on the specific purpose of the request.
... and on how long the requests will take. Will it likely time out, i. e. do you do something long-running?
And if the client needs just "got it working on it" as a response
or actual response data.
E.g. for handling financial data -- where the request has to be processed, and processed exactly once -- I'd use a queue.
With checking for duplicate requests, failed requests, ability to retry and so on.
Other extreme, if it's something like "Make me a PDF of this" I'll just pass execptions right back to the browser
and inform the human to please press this button again.




>
>
>
> --
> You received this message because you are subscribed to the Google Groups "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/20152777-2847-4b94-974c-27be70ee04can%40googlegroups.com.


--
Michael Ross <gmx@ross.cx>

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/20210627175033.7e7d484863782101cc343728%40ross.cx.