Use 404 when there are no NATS handlers

main.go

@@ -120,8 +120,14 @@ func main() {
 		// Send the NATS request and wait synchronously for a reply (timeout: 30 seconds)
 		reply, err := nc.RequestMsg(&msg, 30*time.Second)
 		if err != nil {
-			http.Error(w, "Error processing request", http.StatusInternalServerError)
 			log.Println("NATS request error:", err)
+
+			// Handle specific NATS error cases
+			if err == nats.ErrNoResponders || strings.Contains(err.Error(), "no responders") {
+				http.Error(w, "No service available to handle request", http.StatusNotFound)
+			} else {
+				http.Error(w, "Error processing request", http.StatusInternalServerError)
+			}
 			return
 		}