API: Cache-Control (browser caching) for datasource resources: part 2 (#63060)

* Check if header string contains "public" or "private" target values

pkg/middleware/middleware.go

@@ -109,10 +109,11 @@ func allowCacheControl(rw web.ResponseWriter) bool {
 	foundPrivate := false
 	foundPublic := false
 	for _, val := range ccHeaderValues {
-		if val == "private" {
+		strings.Contains(val, "private")
+		if strings.Contains(val, "private") {
 			foundPrivate = true
 		}
-		if val == "public" {
+		if strings.Contains(val, "public") {
 			foundPublic = true
 		}
 	}