Function validHeaderFieldByte

textproto_reader.go:366–368

validHeaderFieldByte reports whether b is a valid byte in a header field name. RFC 7230 says: header-field = field-name ":" OWS field-value OWS field-name = token tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA token

(b byte)

//	        "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
//	token = 1*tchar
func validHeaderFieldByte(b byte) bool {
	return int(b) < len(isTokenTable) && isTokenTable[b]
}

// canonicalMIMEHeaderKey is like CanonicalMIMEHeaderKey but is
// allowed to mutate the provided byte slice before returning the