Note that https://datatracker.ietf.org/doc/html/draft-ietf-httpapi-idempotency-key-header-05#section-2.1 does seem to show this header with double-quotes around the value, but that seems like maybe a mistake (or maybe just a difference between the spec shows stuff vs. how HTTP headers actually gets generated in the wild).
Bug 1941375 Comment 2 Edit History
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Note that https://datatracker.ietf.org/doc/html/draft-ietf-httpapi-idempotency-key-header-05#section-2.1 does seem to show this header with double-quotes around the value, but that seems like maybe a mistake (or maybe just a difference between the spec shows stuff vs. how HTTP headers actually get generated in the wild).