--- a/Core/Enumerations.cpp	Fri Nov 13 15:06:45 2015 +0100
+++ b/Core/Enumerations.cpp	Tue Nov 17 17:46:32 2015 +0100
@@ -151,6 +151,9 @@
       case ErrorCode_EmptyRequest:
         return "The request is empty";
 
+      case ErrorCode_NotAcceptable:
+        return "Cannot send a response which is acceptable according to the Accept HTTP header";
+
       case ErrorCode_SQLiteNotOpened:
         return "SQLite: The database is not opened";
 
@@ -1131,6 +1134,9 @@
       case ErrorCode_Unauthorized:
         return HttpStatus_401_Unauthorized;
 
+      case ErrorCode_NotAcceptable:
+        return HttpStatus_406_NotAcceptable;
+
       default:
         return HttpStatus_500_InternalServerError;
     }