}
	for len(x) > 0 && isOWS(x[len(x)-1]) {
		x = x[:len(x)-1]
	}
	return x
}

// headerValueContainsToken reports whether v (assumed to be a
// 0#element, in the ABNF extension described in RFC 7230 section 7)
// contains token amongst its comma-separated tokens, ASCII
// case-insensitively.
func headerValueContainsToken(v string, token string) bool {