IfRange           string     `json:"ifRange,omitempty" msg:",omitempty"`
	IfPartNumber      int        `json:"ifPartNumber,omitempty" msg:",omitempty"`
}

// IsSet tells the cache lookup to avoid sending a request
func (r *CondCheck) IsSet() bool {
	if r == nil {
		return false
	}
	return r.IfMatch != "" || r.IfNoneMatch != "" || r.IfModifiedSince != nil || r.IfUnModifiedSince != nil || r.IfRange != ""
}

	_ = setDebugMemoryLimit(ctx)

	err = sys.SetMaxMemoryLimit(maxLimit, maxLimit)
	return err
}

func setDebugMemoryLimit(ctx *cli.Context) error {
	if ctx == nil {
		return nil
	}
	if ctx.IsSet("memlimit") {
		memlimit := ctx.String("memlimit")
		if memlimit == "" {
			memlimit = ctx.GlobalString("memlimit")
		}
		mlimit, err := humanize.ParseBytes(memlimit)
		if err != nil {
			return err
		}

	}
	return w.Flush()
}

func configSource(flag string, v env.VariableInfo) string {
	// Environment variables have high precedence in Viper
	if v.IsSet() {
		return "$" + v.GetName()
	}

	if viper.InConfig(flag) {
		return root.IstioConfig
	}

	return "default"

			continue
		}

		var isSet bool
		for _, userMetadataPrefix := range userMetadataKeyPrefixes {
			if !stringsHasPrefixFold(k, userMetadataPrefix) {
				continue
			}
			w.Header()[strings.ToLower(k)] = []string{v}
			isSet = true
			break
		}

		if !isSet {
			w.Header().Set(k, v)
		}
	}

	var start, rangeLen int64