v3.1.2: Fix guidance on headers and RFC6570 percent-encoding #4819
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Note: Since this is just correcting incorrect guidance rather than changing the actual behavior, it is suitable for a patch release. I will port it to 3.2, where it will be paired with a fix to
allowReserved
that is not needed in 3.1.2, once merged.Fixes part of #4798.
After much debate and research, we agreed that percent-encoding was never meant to be applied to headers.
Exactly how to handle RFC6570 with cookie parameters remains TBD. For now, this preserves (but streamlines) the existing guidance for cookies.