Bugzilla – Bug 1015
Drop "Warning: X-UA-Compatible is a browser-specific HTTP header."
Last modified: 2015-01-26 13:47:29 CET
http://bravotv.com gives that message, but the validator no longer complains about x-ua-compatible <meta> so it shouldn't complain about the header either.
https://github.com/validator/validator/pull/25