backend: fix the infinite loop bug when trying to access the endpoints

Author: 0l1v3rr

src/app.ts

@@ -1,4 +1,4 @@
-import express, { Application } from "express";
+import express, { Application, Response, NextFunction } from "express";
 import path from "path";
 import cors from "cors";
 import { getCard } from "./controllers/cards-controller";
@@ -7,15 +7,16 @@ const app: Application = express();
 
 const PORT = process.env.PORT || 8080;
 
+app.get("/api/cards", getCard);
+app.get("/api/themes", cors(), getThemes);
+
 app.use(
   "/",
   express.static(path.join(__dirname, "..", "client", "build")),
-  (_, res) => {
+  (_, res: Response, next: NextFunction) => {
     res.setHeader("Cache-Control", "no-store, no-cache");
+    next();
   }
 );
 
-app.get("/api/cards", getCard);
-app.get("/api/themes", cors(), getThemes);
-
 app.listen(PORT, () => console.log("The server is running!"));