[TwigBundle] Add Content-Type header for exception response #23052
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This PR comes after I was looking to customize the way exceptions are served for a JSON API (grabbed the info at http://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:
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.