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d76330645a
It turns out that the validation of header values in db5f16f042
was a bit over aggressive. extract_token_headers previously treated
empty list elements (empty or whitespace-only after trimming) as parse
failures. This is incorrect per RFC 9110, which specifies that
recipients must ignore empty list elements in comma-separated header
values.
> A recipient MUST parse and ignore a reasonable number of empty
> list elements