fix

Backend/Controllers/Admin/AdminLogin.php

@@ -19,18 +19,18 @@ if(isset($_POST['aLogin'])){
             $_SESSION['userName'] = $userName;
             $_SESSION['admin'] = true;
             $_SESSION['success'] = "You are now logged in";
-            http_response_code(200);
+            echo http_response_code(200);
         }else{
             session_destroy();
             echo "Fail to verify password";
-            http_response_code(401);
+            echo http_response_code(401);
         }
 
     }else{
         session_destroy();
         echo "No user";
-        http_response_code(401);
+        echo http_response_code(401);
     }
 }else{
-    http_response_code(400);
+    echo http_response_code(400);
 }

Backend/Controllers/Admin/AdminSignup.php

@@ -10,13 +10,13 @@ if (isAdmin()){
         $admin->user_name = $_POST["newUsername"];
         $admin->password = $_POST["newPassword"];
         if ($admin->save()){
-            http_response_code(201);
+            echo http_response_code(201);
         }else{
-            http_response_code(500);
+            echo http_response_code(500);
         }
     }else{
-        http_response_code(400);
+        echo http_response_code(400);
     }
 }else{
-    http_response_code(401);
+    echo http_response_code(401);
 }