305420 2026-01-13 13:52:24 -0800 WebKit has too many concepts of custom user agent 2026-01-14 00:12:11 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 bfulgham webkit-unassigned karl+webkit webkit-bug-importer oldest_to_newest 2171553 0 bfulgham 2026-01-13 13:52:24 -0800 WebKit's architecture spreads the concept of `custom User Agent` in too many places. It's part of FrameLoader, DocumentLoader, WebsiteDataPolicy, and also held as `customUserAgent` and `customUserAgentAsSiteSpecificQuirks`. This is confusing and leads to errors. We should fix this. 2171611 1 webkit-bug-importer 2026-01-13 16:27:04 -0800 <rdar://problem/168103063> 2171723 2 karl+webkit 2026-01-14 00:12:11 -0800 We can adopt a step by step for fixing this. I have a patch which consolidate needs*UserAgent into one function with a parameter passage. That would progress things too.