rest/access_log_apache.go
func (u *accessLogUtil) BytesWritten() int64 {
	if u.R.Env["BYTES_WRITTEN"] != nil {
		return u.R.Env["BYTES_WRITTEN"].(int64)
	}
	return 0
}
func (u *accessLogUtil) BytesWritten() int64 {
	if u.R.Env["BYTES_WRITTEN"] != nil {
		return u.R.Env["BYTES_WRITTEN"].(int64)
	}
	return 0
}
// As recorded by the recorder middleware.