CommonMiddleware ETag processing doesn't work as expected

[Oleksiy Ivanenko]

Hello!

I'm trying to use django.middleware.common.CommonMiddleware to set ETags and it seems to me, that I found a bug.

if settings.USE_ETAGS:
    if not response.has_header('ETag'):
        set_response_etag(response)

    if response.has_header('ETag'):
        return get_conditional_response(  # always returns response with 200 code
            request,
            etag=response['ETag'],
            response=response,
        )

Actual result:
django.utils.cache.get_conditional_response Always returns original response, even if ETag from header corresponds to ETag of current content.

Expected result:
django.utils.cache.get_conditional_response Must return HttpResponseNotModified response with 304 status, if ETag from header corresponds to ETag of current content.

I think the reason of such behaviour:

1. etag argument passes to get_conditional_response as quoted string (as specified in RFC). For example: '"281abb9608fa10d8839e5e8df5c98b0b"'
2. Inside get_conditional_response etags list is parsed from headers as list of unquoted strings. For example: ['281abb9608fa10d8839e5e8df5c98b0b']
3. Then etag in etags check allways returns False!

Is it a bug, or expected?

[Denis Cornehl]

Hi Oleksiy, 

what version of Django are you using? 

There was a bug:

https://code.djangoproject.com/ticket/26024

fixed here

https://github.com/django/django/commit/186b6c61bfe85afa4d6bf213d04a28dd2853fed2

which was released in Django 1.9.2 

-- 

Freundliche Grüße

Denis Cornehl

Sonntagstr. 2 / 10245 Berlin

M: +49 (151) 25 25 1450

@: denis....@gmail.com

http://www.for-a-faster-web.com

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[Oleksiy Ivanenko]

Hi Denis,

I'm using django 1.9
Thanks for issue and PR links. It seems reasonable now to upgrade to django 1.9.2 :)