http2ErrCodeHTTP11Required:     "HTTP_1_1_REQUIRED",
}

func (e http2ErrCode) String() string {
	if s, ok := http2errCodeName[e]; ok {
		return s
	}
	return fmt.Sprintf("unknown error code 0x%x", uint32(e))
}

func (e http2ErrCode) stringToken() string {
	if s, ok := http2errCodeName[e]; ok {
		return s
	}
	return fmt.Sprintf("ERR_UNKNOWN_%d", uint32(e))
}