module Header
Nested
Definitions
TOKEN = /[!#$%&'*+\-.^_`|~0-9A-Z]+/i
According to https://tools.ietf.org/html/rfc7231#appendix-C
QVALUE = /0(\.[0-9]{0,3})?|1(\.[0]{0,3})?/
https://tools.ietf.org/html/rfc7231#section-5.3.1