solidjs / solid / 33294533938

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feat(web): label the unknown-id 404 so version skew is recoverable (#3110)

A call whose well-formed address is not registered in the answering
deployment is the ordinary consequence of deploying under open tabs, and
until now it surfaced as a bare 404 nothing could act on. The server now
labels it with X-Server-Function-Unknown, and the client stamps
unknownFunction: true (plus a directed message) on the rejection, so an
integration can recover — reload the document onto the current build —
instead of showing a generic failed call. Meaningless-path 404s stay
unlabelled: a mistyped route is not skew.

Co-authored-by: Cursor <cursoragent@cursor.com>

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