docs: document UploadValidator for rejecting uploads#5828
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Co-authored-by: Knoobie <Knoobie@gmx.de>
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Documents the new
UploadValidatorAPI from flow#24925, which lets thebuilt-in upload handlers refuse an upload while it's being received.
Previously only a fully custom
UploadHandlercould callUploadEvent.reject(...); the pre-made handlers (InMemoryUploadHandler,FileUploadHandler,TemporaryFileUploadHandler) had no supported way toreject an upload mid-transfer.
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Please review the wording yourself before marking this PR ready.