https://bugzilla.wikimedia.org/show_bug.cgi?id=40779

--- Comment #9 from Mark Bergsma <m...@nedworks.org> 2012-10-23 13:54:06 UTC ---
It was reported that seeking still wasn't working, because Firefox didn't get
(and display) the video length.

I found an additional problem: due to our 2-tier Varnish setup
(frontend/backend instances), Varnish was sending some headers in duplicate as
it's not properly filtering. This included the Content-Length header,
Accept-Ranges, Age and Via.

I first suspected the Content-Length header being the problem, and fixed this
problem in Varnish, only happening while streaming:

https://gerrit.wikimedia.org/r/#/c/29565/

But this didn't fix the issue with Firefox. I've now added some hacky VCL code
to remove the duplicate Accept-Ranges header, and this turned out to be the
culprit.

It's fixed by this workaround for now, but the proper fix would be to make
Varnish filter headers appropriately. The remaining duplicates don't seem to
cause issues right now, but it's hard to know for sure.

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