Use always strings for cache keys (#13631)

* Use always strings for cache keys

* fixing tests

* Addressing PR review comments

* Adding the base to FormatInt

* Fix typo

api4/openGraph.go

@@ -51,7 +51,7 @@ func getOpenGraphMetadata(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	og := c.App.GetOpenGraphMetadata(url)
 	ogJSON, err := og.ToJSON()
-	openGraphDataCache.AddWithExpiresInSecs(props["url"], ogJSON, 3600) // Cache would expire after 1 hour
+	openGraphDataCache.AddWithExpiresInSecs(url, ogJSON, 3600) // Cache would expire after 1 hour
 	if err != nil {
 		w.Write([]byte(`{"url": ""}`))
 		return