Are you making the request from a browser? If so, your browser is
probably making an extra request for the favicon. So if your middleware
handles /all/ requests (even ones that ultimately result in 404) then
it'll be executed twice. It will look like it's twice for one request,
but it's actually two separate requests.
_Nik
On 3/19/2014 10:00 AM, Tyler Bettilyon wrote:
> Hello!
>
> I recently switched my Django environment from using Apache to
> Gunicorn. After this switch we noticed that our middleware was being
> called twice for each request. To confirm my suspicion I wrote a new
> piece of middleware:
>
> class TemporaryMiddleware(object):
> def process_request(self, request):
> if not hasattr(request, '_secret'):
> request._secret = uuid.uuid4()
> logging.info("set secret to {0}".format(request._secret))
> else:
> logging.info(request._secret)
>
>
> def process_response(self, request, response):
> logging.info("response {0}{1}".format(request._secret,
> response.status_code))
> return response
>
> After registering my TemporaryMiddleware I headed back to the logs:
> INFO 2014-03-19 09:32:23,397 middleware.py:26] set secret to
> bb89e0ab-a30b-42ce-800b-7129a3b323ae
> INFO 2014-03-19 09:32:23,398 middleware.py:28]
> bb89e0ab-a30b-42ce-800b-7129a3b323ae
> INFO 2014-03-19 09:32:23,841 middleware.py:32] response
> bb89e0ab-a30b-42ce-800b-7129a3b323ae200
> INFO 2014-03-19 09:32:24,126 middleware.py:32] response
> bb89e0ab-a30b-42ce-800b-7129a3b323ae200
>
> If the only change I make is to start the server using:
> python manage.py runserver
>
> Instead of:
> python manage.py run_gunicorn
>
> my logs say:
> INFO 2014-03-19 09:48:25,325 middleware.py:26] set secret to
> 84b011f9-1689-4b2f-8202-01840c249937
> INFO 2014-03-19 09:48:25,842 middleware.py:33] response
> 84b011f9-1689-4b2f-8202-01840c249937200
>
> It seems to me that every request is being processed twice. This
> happens regardless of the number of threads or workers available, and
> when I run with more than 1 worker and/or more than one thread the
> process and thread id's for all four logging statements are the same.
> So I believe one thread is running through all of my middleware twice
> per request.
>
> Has anyone seem anything like this before, or have any idea what might
> be going on? I've only been Djangoing for ~6 months and sometimes
> configuration stuff still escapes me.
>
> Thanks,
> Tyler Bettilyon
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