[undertow-dev] response-code handler bypasses configured error pages

[Stuart Douglas]

The predicate languages are executed before the Servler handlers, so they
won't be handled by Servlet error pages.

If you are setting this all up programmatically you could use
io.undertow.servlet.api.DeploymentInfo#addOuterHandlerChainWrapper to setup
the predicate handler after the initial servlet one, which should mean that
the servlet error handling will handle the response code.

Stuart

On Fri, 3 Jul 2020 at 08:25, Brad Wood <bdw429s at gmail.com> wrote:

> When I configure an error page similar to this:
>
> servletBuilder.addErrorPage( new ErrorPage( "404.html", 404));
>
> This works great when I hit a path in my browser that doesn't exist.  The
> contents of the *404.html* file is served with a response code of *404*.
>
> However, if I also use the predicate language to define something like:
>
> path(/box.json)->response-code(404)
>
> and then I hit *localhost/box.json* in my browser, I get a *404* status
> code but with no response body.
>
>    - The docs say the response-code handler ends the exchange, but
>    should it still respect the error pages?
>    - How can I modify my use of Undertow to respect the error pages
>    when using the response-code handler?
>    - I've seen in the docs the ability to have a
>    *addDefaultResponseListener()* but I'm not sure if it is the correct
>    solution for this, nor how I would access the error page configuration
>    dynamically as to not need to duplicate my work.
>
> Thanks!
>
> ~Brad
>
> *Developer Advocate*
> *Ortus Solutions, Corp *
>
> E-mail: brad at coldbox.org
> ColdBox Platform: http://www.coldbox.org
> Blog: http://www.codersrevolution.com
>
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