#9249: Google Analytics' Cookies break CacheMiddleware when SessionMiddleware
turns on Vary: Cookie
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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
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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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Ticket URL: <https://code.djangoproject.com/ticket/9249#comment:13>
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