func removeEmptyPort(host string) string {
	if hasPort(host) {
		return strings.TrimSuffix(host, ":")
	}
	return host
}

func isNotToken(r rune) bool {
	return !httpguts.IsTokenRune(r)
}

// stringContainsCTLByte reports whether s contains any ASCII control character.
func stringContainsCTLByte(s string) bool {
	for i := 0; i < len(s); i++ {
		b := s[i]
		if b < ' ' || b == 0x7f {

	'p':  true,
	'q':  true,
	'r':  true,
	's':  true,
	't':  true,
	'u':  true,
	'v':  true,
	'w':  true,
	'x':  true,
	'y':  true,
	'z':  true,
	'|':  true,
	'~':  true,
}

func IsTokenRune(r rune) bool {
	return r < utf8.RuneSelf && isTokenTable[byte(r)]
}

// HeaderValuesContainsToken reports whether any string in values
// contains the provided token, ASCII case-insensitively.

//	lowercase prior to their encoding in HTTP/2. "
func http2validWireHeaderFieldName(v string) bool {
	if len(v) == 0 {
		return false
	}
	for _, r := range v {
		if !httpguts.IsTokenRune(r) {
			return false
		}
		if 'A' <= r && r <= 'Z' {
			return false
		}
	}
	return true
}

func http2httpCodeString(code int) string {
	switch code {
	case 200: