Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+--
 Reporter:  pixelcort  |Owner:  (none)
 Type:  New feature|   Status:  closed
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:  wontfix
 Keywords:  cache cookies  | Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Changes (by Mariusz Felisiak):

 * status:  new => closed
 * needs_better_patch:  1 => 0
 * needs_docs:  1 => 0
 * has_patch:  1 => 0
 * resolution:   => wontfix
 * stage:  Accepted => Unreviewed


Comment:

 This issue is rather niche, moreover, the
 [https://code.djangoproject.com/ticket/9249#comment:19 Collin's
 workaround] is straightforward and can be implemented by any app on its
 own. As far as I'm aware it's not something that Django itself has to
 provide.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  (none)
 Type:  New feature|   Status:  new
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by Mariusz Felisiak):

 * owner:  Łukasz Langa => (none)
 * status:  assigned => new


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  ambv
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+

Comment (by collinanderson):

 A work around is to create a middleware that deletes all the cookies in
 request.COOKIE that django should ignore. (Just don't delete the important
 cookies. :) Example from DjangoCon.eu  2016: https://youtu.be/AZ4ISa1u-
 HE?t=12548

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  ambv
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by ambv):

 * owner:  anonymous => ambv


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+-
 Reporter:  pixelcort  |Owner:  anonymous
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+-
Changes (by anonymous):

 * owner:  vvd => anonymous


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by aaugustin):

 * version:  1.4-rc-2 => 1.0
 * type:  Bug => New feature


Old description:

> When using Google Analytics on a Django project with CacheMiddleware and
> SessionMiddleware turned on, the Cookies that Google Analytics apparently
> change on each reload, invalidating the Vary: Cookie parameter that
> SessionMiddleware is setting.
>
> There should be a way to define cookie prefixes, such as '__utm', to
> ignore for cookie variation for caching.

New description:

 When using Google Analytics on a Django project with CacheMiddleware and
 SessionMiddleware turned on, the Cookies that Google Analytics apparently
 change on each reload, invalidating the Vary: Cookie parameter that
 SessionMiddleware is setting.

 There should be a way to define cookie prefixes, such as ``'__utm'``, to
 ignore for cookie variation for caching.

--

Comment:

 If you look at the discussion, this isn't a bug; it's really a new
 feature.

 The version field tracks the version the bug was reported in.

 Related: #15201. Caching is hard.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  Bug|   Status:  assigned
Component:  HTTP handling  |  Version:  1.4-rc-2
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by anonymous):

 * needs_docs:  0 => 1
 * version:  1.0 => 1.4-rc-2
 * type:  New feature => Bug


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by trbs):

 * cc: trbs@… (added)


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+

Comment (by KyleMac):

 I've now managed to get this to work in Internet Explorer and Firefox.

 The fix for IE is quite simple and is due to it sending a non standard
 `If-Modified-Since` header that ConditionalGetMiddleware fails to parse.
 I've opened ticket #18648 for that.

 While Firefox won't send `If-Modified-Since` with `Vary: Cookie` it will
 send back the Etag. So to get Firefox to work as expected all you need to
 do is use a hash of `Last-Modified` as the Etag (assuming there isn't
 already a proper Etag for the response).

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+

Comment (by KyleMac):

 It was easy to monkey patch `django.http.parse_cookie` to use a custom
 dictionary that logs gets and sets but I had to take into account some
 things.

 1. This CSRF middleware accesses `CSRF_COOKIE_NAME` on every request so
 ignore that and check `request.META.get['CSRF_COOKIE_USED']` instead.
 2. The session middleware accesses `SESSION_COOKIE_NAME` on every request
 so ignore that and check `request.session.accessed` instead.
 3. There may be other contrib middleware I'm not using and the best
 solution would be for everything to not access their cookies until needed.

 However, it turns out that IE and Firefox have the same issue but client
 side. The Google Analytics cookies will cause them to completely
 invalidate their cache and will not even send `If-Modified-Since` and so
 any site that uses `Vary: Cookie` and Google Analytics effectively has no
 client side caching for the majority of their users.

 In Chrome requests go something like the following (Opera and Safari seem
 similar but I've tested them less).

 1. Chrome requests a page and gets the following:

 {{{
 Cache-Control: public, max-age=600
 Vary: Cookie
 }}}

 2. If you navigate away from the page and come back to it (the actual
 reload button sometimes behaves differently in Chrome to other browsers)
 and the page hasn't expired (i.e. `max-age`) then SOMETIMES it will just
 serve that from the cache. I don't really understand this and it's
 probably some kind of heuristics.
 3. Otherwise request a new page with the `If-Modified-Since` and the
 contents of our cookies. Due to my monkey patch and custom decorator it
 gets a 304 response and all is good.

 In IE (I tested 9 and 10) and Firefox (currently 14) it's more like the
 following.

 1. Receive a page with the same headers as above.
 2. Once the page is loaded, Google Analytics updates it cookies and now
 the page is immediately completely invalidated.
 3. Nothing is ever served from the local cache and so a new request is
 sent. However since the page was invalidated in step 2 not even an `If-
 Modified-Since` header is sent and so you get a full 200 response every
 single time.

 I might now go in the opposite direction and strip out `Vary: Cookie` on
 every response and raise an exception if any cached view tries to access
 cookies it wasn't meant to.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+

Comment (by harm):

 The suggestion mentioned in comment:6: "automatically only taking into
 account the actual used cookies in the cache key"  that would work also in
 the following case:

   * csrf middleware is enabled  (so user sends csrftoken cookie every
 request.
   * Some view A depends on cookie foobar_enabled (2 values), but that
 specific view does NOT use any csrf token.
   In the current situation caching view A does not work between clients
 (as different csrf tokens cooies, cause different cache keys in the view
 that doesn't use this cookie)

 With suggestion comment:6 this would automatically work.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by harm.verhagen@…):

 * cc: harm.verhagen@… (added)


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by jedie):

 * cc: django@… (added)


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by raymond.penners@…):

 * cc: raymond.penners@… (added)


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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |Owner:  vvd
 Type:  New feature|   Status:  assigned
Component:  HTTP handling  |  Version:  1.0
 Severity:  Normal |   Resolution:
 Keywords:  cache cookies  | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+

Comment (by anonymous):

 Instead of listing individual cookies explicitly, I feel it would be
 better to have Django keep a record on whether or not a cookie was been
 accessed.  This can be done in similar fashion as to how Django currently
 checks whether or not the session was accessed.

 Benefits:
 - This would work without any configuration. Any additional cookies set by
 whatever frontend Javascript code that are not used by Django views would
 automatically be ignored.
 - No new setting & accompanying documentation

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+---
   Reporter:  pixelcort|  Owner:  vvd
   Type:  New feature  | Status:  assigned
  Milestone:   |  Component:  HTTP handling
Version:  1.0  |   Severity:  Normal
 Resolution:   |   Keywords:  cache cookies
   Triage Stage:  Accepted |  Has patch:  1
Needs documentation:  0|Needs tests:  0
Patch needs improvement:  1|  Easy pickings:  0
  UI/UX:  0|
---+---
Changes (by lukeplant):

 * ui_ux:   => 0
 * easy:   => 0


Comment:

 Regarding regexes - I would favour using compiled regexes - this is
 consistent with other settings that are regexes. (Only the URL conf
 appears to be different here).

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+-
   Reporter:  pixelcort|Owner:  vvd
   Type:  New feature  |   Status:  assigned
  Milestone:   |Component:  HTTP handling
Version:  1.0  | Severity:  Normal
 Resolution:   | Keywords:  cache cookies
   Triage Stage:  Accepted |Has patch:  1
Needs documentation:  0|  Needs tests:  0
Patch needs improvement:  1|
---+-
Changes (by carljm):

 * needs_better_patch:  0 => 1
 * type:   => New feature
 * severity:   => Normal


Comment:

 If we add a workaround for this, we need to make it clear in the docs that
 this is a workaround that will help Django's internal cache, but upstream
 HTTP caches will still be broken unless they also special-case Google
 Analytics cookies. See for instance https://groups.google.com/group
 /analytics-help-integrations/browse_thread/thread/6c9d4a0fea1cc1d2

 It's really Google Analytics that's breaking HTTP caching here (more
 specifically, any use of Vary: Cookie, which is part of HTTP caching). We
 can provide a Django-specific workaround, but that doesn't fix the core
 problem, which isn't in Django.

 Categorizing as a "new feature," since what's under discussion here is not
 a bug in Django, but a new feature to ease working around a problem with
 Google Analytics.

 The latest patch here looks pretty reasonable. The setting should be just
 a list of plain regex strings, though, to simplify using it - the
 compilation can be done by the middleware once at startup time.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
+---
  Reporter:  pixelcort  | Owner:  vvd  
Status:  assigned   | Milestone:   
 Component:  HTTP handling  |   Version:  1.0  
Resolution: |  Keywords:  cache cookies
 Stage:  Accepted   | Has_patch:  1
Needs_docs:  0  |   Needs_tests:  0
Needs_better_patch:  0  |  
+---
Changes (by vvd):

  * keywords:  => cache cookies
  * status:  new => assigned
  * has_patch:  0 => 1

Comment:

 I've created a patch which introduce CACHE_MIDDLEWARE_IGNORE_COOKIES
 setting, to specify cookies not to be considered in building cache key.

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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
+---
  Reporter:  pixelcort  | Owner:  vvd
Status:  new| Milestone: 
 Component:  HTTP handling  |   Version:  1.0
Resolution: |  Keywords: 
 Stage:  Accepted   | Has_patch:  0  
Needs_docs:  0  |   Needs_tests:  0  
Needs_better_patch:  0  |  
+---
Changes (by vvd):

  * owner:  nobody => vvd

-- 
Ticket URL: 
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The Web framework for perfectionists with deadlines.
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Re: [Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
+---
  Reporter:  pixelcort  | Owner:  nobody
Status:  new| Milestone:
 Component:  HTTP handling  |   Version:  1.0   
Resolution: |  Keywords:
 Stage:  Accepted   | Has_patch:  0 
Needs_docs:  0  |   Needs_tests:  0 
Needs_better_patch:  0  |  
+---
Changes (by thejaswi_puthraya):

  * component:  Uncategorized => HTTP handling

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Ticket URL: 
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The Web framework for perfectionists with deadlines.
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[Django] #9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware turns on Vary: Cookie

[Django]

#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
---+
 Reporter:  pixelcort  |   Owner:  nobody
   Status:  new|   Milestone:
Component:  Uncategorized  | Version:  1.0   
 Keywords: |   Stage:  Unreviewed
Has_patch:  0  |  
---+
 When using Google Analytics on a Django project with CacheMiddleware and
 SessionMiddleware turned on, the Cookies that Google Analytics apparently
 change on each reload, invalidating the Vary: Cookie parameter that
 SessionMiddleware is setting.

 There should be a way to define cookie prefixes, such as '__utm', to
 ignore for cookie variation for caching.

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Ticket URL: 
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