Hello,

Happstack uses monad-control. You can use catch from lifted-base to
catch the exception. I have attached a simple demo.

You can learn more about monad-control many places including here:

https://www.fpcomplete.com/user/jwiegley/monad-control

- jeremy

On Mon, Jan 13, 2014 at 3:50 PM, Corentin Dupont
<corentin.dupont@gmail.com> wrote:
> Hi Jeremy, all,
> In Happstack when I throw an error, I obtain a blank page with "server
> error: my message".
> How can I decorate this page?
> I'd like to have it look like the other pages of my website, and a "back to
> login" link, for example.
>
> Thanks!
> Corentin
>

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