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h=a:a:b:c:b:d A: 1 A: 2 B: 3 C: 4 B: 5 D: 6 h=a:a:b:c:b:d C: 4 D: 6 B: 3 B: 5 A: 0 A: 1 A: 2 When RFC4870 signing with an h= tag, a signer MUST include all headers presented to the signing algorithm, in the order they were presented the signing algorithm. a signer, when encountering multiple-occuring headers, MAY list those header names more than once -- I conclude from this that signers SHOULD reorder the headers so that multiple-occuring headers occur together. -- a verifier, if a header is listed only once in h=, but there are multiple of those headers available, MUST play back those multiple headers together.