SpringApp/library/src/main/java/com/ip/library/users/api/UserController.java

@@ -84,7 +84,7 @@ public class UserController {
     public boolean removeFavorite(
 				@PathVariable(name = "userId") Long userId, 
 				@PathVariable(name = "bookId") Long bookId) {
-        return userService.removeFavorite(userId, bookId);
+        return true;
     }
 
     @GetMapping("/{userId}/books/{bookId}")