As a follow-up to bug 36577, now that Varnish has replaced Squid for upload.wikimedia.org, we have another remaining major issue. Seeking in video files does no longer work, i.e. the browser does not indicate the length of the video or make seeking features available (tested w/ Firefox). This appears to apply to all videos in production right now, and is apparently due to lack of support for range requests.
This is a major regression and we should (again) switch back if we can't fix it within reasonable time.
To compare Squid/Varnish behavior, add IP of upload-lb.pmtpa.wikimedia.org to your /etc/hosts file as IP for upload.wikimedia.org. Example with the current IPv4 address:
208.80.152.211 upload.wikimedia.org
Version: unspecified
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=41304