…e (rchoquet)This PR was merged into the 2.7 branch.Discussion----------[TwigBundle] Add Content-Type header for exception response| Q             | A| ------------- | ---| Branch?       | 2.7| Bug fix?      | yes| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets || License       | MIT| Doc PR        |This PR comes after I was looking to customize the way exceptions are served for a JSON API (grabbed the info athttp://symfony.com/doc/current/controller/error_pages.html#overriding-the-default-exceptioncontroller).I noticed that even when changing the request format to 'json' so that the right json.twig template is served:```php// in my override of the ExceptionControllerpublic function showAction(Request $request, FlattenException $exception, DebugLoggerInterface $logger = null){    $request->setRequestFormat('json');    return parent::showAction($request, $exception, $logger);}```the response Content-Type header was still 'text/html'.By now, the response Content-Type should be corresponding to the given request format.I also feel there's some room for improvement with the general "displaying error for a JSON API" chapter as it feels strange that there's no configuration option to just say "serve me anything as json", but that's another issue.Commits-------9e2b408 add content-type header on exception response