[Webkit-unassigned] [Bug 82672] [Mac] XHR range requests are broken; affects pdf.js (Test failure: http/tests/xmlhttprequest/range-test.html)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82672

--- Comment #11 from Brion Vibber <brion at pobox.com> ---
I've found that this bug can at least be easily detected at runtime by checking the HTTP status code and Content-Range response header against the expected values. You can then issue a second request with caching disabled and continue on, without hardcoding assumptions about User-Agent strings.

In ogv.js <https://github.com/brion/ogv.js/commit/9ab5bce2f99f13a82a07ab83eeae77ede031e620> I'm using such a check to only apply cache-busting if the bug is actually encountered.

At least on OS X 10.10 I'm seeing the bug only after reaching the *end* of the file; so for the ogv.js media player case this doesn't hit until a second playthrough, unless the file is missing index information in which case a seek to the end is used to calculate the duration before playback begins.

(Note I'm using a query-string as cache-buster so that the request will still be cacheable on the server-side proxy cache; though not ideal it seems to be working.)

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