Return correct headers

app/Api/V1/Controllers/Autocomplete/AccountController.php

@@ -41,6 +41,7 @@ use Illuminate\Http\JsonResponse;
 class AccountController extends Controller
 {
     use AccountFilter;
+    protected array $accepts = ['application/json'];
 
     /** @var array<int, string> */
     private array                      $balanceTypes;
@@ -123,6 +124,6 @@ class AccountController extends Controller
             }
         );
 
-        return response()->json($return);
+        return response()->api($return);
     }
 }

app/Api/V1/Controllers/Autocomplete/BillController.php

@@ -74,6 +74,6 @@ class BillController extends Controller
             }
         );
 
-        return response()->json($filtered->toArray());
+        return response()->api($filtered->toArray());
     }
 }

app/Api/V1/Controllers/Autocomplete/BudgetController.php

@@ -73,6 +73,6 @@ class BudgetController extends Controller
             }
         );
 
-        return response()->json($filtered);
+        return response()->api($filtered);
     }
 }

app/Api/V1/Controllers/Autocomplete/CategoryController.php

@@ -73,6 +73,6 @@ class CategoryController extends Controller
             }
         );
 
-        return response()->json($filtered);
+        return response()->api($filtered);
     }
 }

app/Api/V1/Controllers/Autocomplete/CurrencyController.php

@@ -77,7 +77,7 @@ class CurrencyController extends Controller
             ];
         }
 
-        return response()->json($result);
+        return response()->api($result);
     }
 
     /**
@@ -103,6 +103,6 @@ class CurrencyController extends Controller
             ];
         }
 
-        return response()->json($result);
+        return response()->api($result);
     }
 }

app/Api/V1/Controllers/Autocomplete/ObjectGroupController.php

@@ -75,6 +75,6 @@ class ObjectGroupController extends Controller
             ];
         }
 
-        return response()->json($return);
+        return response()->api($return);
     }
 }

app/Api/V1/Controllers/Autocomplete/PiggyBankController.php

@@ -87,7 +87,7 @@ class PiggyBankController extends Controller
             ];
         }
 
-        return response()->json($response);
+        return response()->api($response);
     }
 
     /**
@@ -124,6 +124,6 @@ class PiggyBankController extends Controller
             ];
         }
 
-        return response()->json($response);
+        return response()->api($response);
     }
 }

app/Api/V1/Controllers/Autocomplete/RecurrenceController.php

@@ -73,6 +73,6 @@ class RecurrenceController extends Controller
             ];
         }
 
-        return response()->json($response);
+        return response()->api($response);
     }
 }

app/Api/V1/Controllers/Autocomplete/RuleController.php

@@ -72,6 +72,6 @@ class RuleController extends Controller
             ];
         }
 
-        return response()->json($response);
+        return response()->api($response);
     }
 }

app/Api/V1/Controllers/Autocomplete/RuleGroupController.php

@@ -72,6 +72,6 @@ class RuleGroupController extends Controller
             ];
         }
 
-        return response()->json($response);
+        return response()->api($response);
     }
 }

app/Api/V1/Controllers/Autocomplete/TagController.php

@@ -75,6 +75,6 @@ class TagController extends Controller
             ];
         }
 
-        return response()->json($array);
+        return response()->api($array);
     }
 }

app/Api/V1/Controllers/Autocomplete/TransactionController.php

@@ -84,7 +84,7 @@ class TransactionController extends Controller
             ];
         }
 
-        return response()->json($array);
+        return response()->api($array);
     }
 
     /**
@@ -122,6 +122,6 @@ class TransactionController extends Controller
             ];
         }
 
-        return response()->json($array);
+        return response()->api($array);
     }
 }

app/Api/V1/Controllers/Autocomplete/TransactionTypeController.php

@@ -72,6 +72,6 @@ class TransactionTypeController extends Controller
             ];
         }
 
-        return response()->json($array);
+        return response()->api($array);
     }
 }

app/Api/V1/Controllers/Controller.php

@@ -26,6 +26,7 @@ namespace FireflyIII\Api\V1\Controllers;
 
 use Carbon\Carbon;
 use Carbon\Exceptions\InvalidFormatException;
+use FireflyIII\Exceptions\BadHttpHeaderException;
 use FireflyIII\Models\Preference;
 use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Support\Facades\Amount;
@@ -60,11 +61,13 @@ abstract class Controller extends BaseController
     use ValidatesRequests;
 
     protected const string CONTENT_TYPE    = 'application/vnd.api+json';
+    protected const string JSON_CONTENT_TYPE = 'application/json';
 
     /** @var array<int, string> */
     protected array        $allowedSort;
     protected ParameterBag $parameters;
     protected bool        $convertToNative = false;
+    protected array $accepts = ['application/json'];
     protected TransactionCurrency $nativeCurrency;
 
     /**
@@ -82,9 +85,15 @@ abstract class Controller extends BaseController
                     $this->convertToNative = Amount::convertToNative();
                     $this->nativeCurrency = Amount::getNativeCurrency();
                     app()->setLocale($language);
-
                 }
 
+
+                // filter down what this endpoint accepts.
+                if (!$request->accepts($this->accepts)) {
+                    throw new BadHttpHeaderException(sprintf('Sorry, Accept header "%s" is not something this endpoint can provide.', $request->header('Accept')));
+                }
+
+
                 return $next($request);
             }
         );

app/Api/V1/Controllers/System/AboutController.php

@@ -58,7 +58,7 @@ class AboutController extends Controller
                            'driver'      => $currentDriver,
                        ];
 
-        return response()->api(['data' => $data])->header('Content-Type', self::CONTENT_TYPE);
+        return response()->api(['data' => $data])->header('Content-Type', self::JSON_CONTENT_TYPE);
     }
 
     /**

app/Api/V1/Controllers/System/ConfigurationController.php

@@ -86,7 +86,7 @@ class ConfigurationController extends Controller
             ];
         }
 
-        return response()->json($return);
+        return response()->api($return);
     }
 
     /**
@@ -142,7 +142,7 @@ class ConfigurationController extends Controller
             ];
         }
 
-        return response()->json(['data' => $data])->header('Content-Type', self::CONTENT_TYPE);
+        return response()->api(['data' => $data])->header('Content-Type', self::JSON_CONTENT_TYPE);
     }
 
     /**
@@ -173,6 +173,6 @@ class ConfigurationController extends Controller
             'editable' => true,
         ];
 
-        return response()->json(['data' => $data])->header('Content-Type', self::CONTENT_TYPE);
+        return response()->api(['data' => $data])->header('Content-Type', self::CONTENT_TYPE);
     }
 }