Lower-case `a-z` are allowed, too, see <https://tools.ietf.org/html/rfc7231#section-4.1> → <https://tools.ietf.org/html/rfc7231#appendix-D> → <https://tools.ietf.org/html/rfc7230#section-3.2.6> → <https://tools.ietf.org/html/rfc7230#section-1.2> → <https://tools.ietf.org/html/rfc5234#appendix-B.1>
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