diff --git a/probe_metrics_list.go b/probe_metrics_list.go
index 7024990..16ed1e7 100644
--- a/probe_metrics_list.go
+++ b/probe_metrics_list.go
@@ -49,6 +49,7 @@ func probeMetricsListHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if !loadedFromCache {
+		w.Header().Add("X-metrics-cached", "false")
 		for _, subscription := range settings.Subscriptions {
 			wg.Add()
 			go func(subscription string) {
@@ -115,10 +116,10 @@ func probeMetricsListHandler(w http.ResponseWriter, r *http.Request) {
 
 		// enable caching if enabled
 		if settings.Cache != nil {
-			w.Header().Add("X-metrics-cached", (*settings.Cache).String())
 			metricsList.StoreToCache(cacheKey, *settings.Cache)
 		}
 	} else {
+		w.Header().Add("X-metrics-cached", "true")
 		prometheusMetricRequests.With(prometheus.Labels{
 			"subscriptionID": "",
 			"handler":        PROBE_METRICS_LIST_URL,
diff --git a/probe_metrics_resource.go b/probe_metrics_resource.go
index 81a325f..4caa094 100644
--- a/probe_metrics_resource.go
+++ b/probe_metrics_resource.go
@@ -61,6 +61,7 @@ func probeMetricsResourceHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if !loadedFromCache {
+		w.Header().Add("X-metrics-cached", "false")
 		for _, target := range settings.Target {
 			result, err := azureInsightMetrics.FetchMetrics(ctx, subscription, target, settings)
 
@@ -88,10 +89,10 @@ func probeMetricsResourceHandler(w http.ResponseWriter, r *http.Request) {
 
 		// enable caching if enabled
 		if settings.Cache != nil {
-			w.Header().Add("X-metrics-cached", (*settings.Cache).String())
 			metricsList.StoreToCache(cacheKey, *settings.Cache)
 		}
 	} else {
+		w.Header().Add("X-metrics-cached", "true")
 		prometheusMetricRequests.With(prometheus.Labels{
 			"subscriptionID": "",
 			"handler":        PROBE_METRICS_RESOURCE_URL,
diff --git a/probe_metrics_scrape.go b/probe_metrics_scrape.go
index 2eaa86c..c3e8445 100644
--- a/probe_metrics_scrape.go
+++ b/probe_metrics_scrape.go
@@ -62,6 +62,7 @@ func probeMetricsScrapeHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if !loadedFromCache {
+		w.Header().Add("X-metrics-cached", "false")
 		for _, subscription := range settings.Subscriptions {
 			wg.Add()
 			go func(subscription string) {
@@ -131,17 +132,16 @@ func probeMetricsScrapeHandler(w http.ResponseWriter, r *http.Request) {
 
 		// enable caching if enabled
 		if settings.Cache != nil {
-			w.Header().Add("X-metrics-cached", (*settings.Cache).String())
 			metricsList.StoreToCache(cacheKey, *settings.Cache)
 		}
 	} else {
+		w.Header().Add("X-metrics-cached", "true")
 		prometheusMetricRequests.With(prometheus.Labels{
 			"subscriptionID": "",
 			"handler":        PROBE_METRICS_SCRAPE_URL,
 			"filter":         settings.Filter,
 			"result":         "cached",
 		}).Inc()
-
 	}
 
 	metricsList.GaugeSet(metricGauge)