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When there is an uncaught exception, Drupal 8 displays a simple dump of the exception.

I find that the page is served as 'Content-Type' = 'text/plain', yet it contains HTML: Error as plain text

It looks better to me when I change the code to serve as 'text/html': Error as HTML

I already found the code to change - it's in FinalExceptionSubscriber.php, which outputs

Formats a string for HTML display by replacing variable placeholders.

My question is:

  1. Does anyone know a reason why the error page is text/plain given that it contains HTML.
  2. Shall I raise an issue and patch?
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    Because this is the most generic exception subscriber for exceptions not handled by any format specific exception subscriber (like html or json). – 4k4 Nov 5 '17 at 16:52
  • @4k4 Thanks for explaining. However it seems that the exceptions do contain HTML. The <br><br> is always there and SafeMarkup::format description is "Formats a string for HTML display by replacing variable placeholders" – AdamS Nov 6 '17 at 17:43
  • (Question edited to clarify that the output does contain HTML) – AdamS Nov 6 '17 at 17:49
  • Yes, that's a bit inconsistent. But you would never show this message in production. If you want to react to a custom exception you would do this in your own exception subscriber. – 4k4 Nov 6 '17 at 17:52
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    This would revert this issue Standardize fatal error/exception handling: backtrace for all formats, not just HTML. Better follow up on this issue and improve the text formatting. – 4k4 Nov 7 '17 at 8:11
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Thanks @4k4, so it seems that this is a minor bug, but the obvious fix would revert the "Standardize handling" issue.

I have raised this issue and linked it to the other issue. I don't really understand the code here and would welcome any help to improve the issue text.

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