diff --git a/backends/gcs/get.go b/backends/gcs/get.go
index 1c5e12e..83990fb 100644
--- a/backends/gcs/get.go
+++ b/backends/gcs/get.go
@@ -61,6 +61,7 @@ func ReadWithCache(ctx context.Context, response http.ResponseWriter,
 	objectHandle := gcs.Bucket(bucket).Object(objectName)
 	// get static-serving metadata and set headers
 	err := setHeaders(ctx, objectHandle, response)
+
 	if err != nil {
 		if err == storage.ErrObjectNotExist {
 			http.Error(response, "", http.StatusNotFound)
@@ -70,6 +71,17 @@ func ReadWithCache(ctx context.Context, response http.ResponseWriter,
 		}
 	}
 
+	// handle Etag
+	ifNoneMatchHeaders, ifNoneMatchHeaderPresent := request.Header[http.CanonicalHeaderKey("if-none-match")]
+	if ifNoneMatchHeaderPresent {
+		for _, etag := range ifNoneMatchHeaders {
+			if etag == response.Header().Get("Etag") {
+				response.WriteHeader(http.StatusNotModified)
+				return
+			}
+		}
+	}
+
 	// try the media cache
 	var media io.Reader
 	var pipeline filter.Pipeline
diff --git a/backends/gcs/headers.go b/backends/gcs/headers.go
index 14495e4..2300daf 100644
--- a/backends/gcs/headers.go
+++ b/backends/gcs/headers.go
@@ -55,6 +55,9 @@ func setHeaders(ctx context.Context, objectHandle *storage.ObjectHandle,
 	if objectAttrs.ContentType != "" {
 		response.Header().Set("Content-Type", objectAttrs.ContentType)
 	}
+	if objectAttrs.Etag != "" {
+		response.Header().Set("Etag", objectAttrs.Etag)
+	}
 	response.Header().Set("Content-Length", fmt.Sprint(objectAttrs.Size))
 	return
 }