How to ignore a route with self-hosted ServiceStack - servicestack

Question

I am currently working on a solution where we have a self-hosted ServiceStack layer running, but the problem is that I keep getting errors when I access it from the browser and the browser tries to get the favicon. As far as I can see there is no option of ignoring a specific route when running self-hosted?
I would have imagined something like
Routes.Ignore("favicon*")
a bit like the
Routes.Add<Foo>("/foo")
in my AppHost Configure method

Answer 1

In my web.config I like to have something like this
<handlers>
<add verb="*" path="*.*" type="System.Web.StaticFileHandler" name="files" />
<add path="*" name="ServiceStack.Factory" type="ServiceStack.WebHost.Endpoints.ServiceStackHttpHandlerFactory, ServiceStack" verb="*" preCondition="integratedMode" resourceType="Unspecified" allowPathInfo="true"/>
</handlers>
That way all files with an extension get handled by IIS and means you don't have to go all the way through the aspnet pipeline to server up a 404. It also means you don't log a load of 404s in your servicestack application.

Answer 2

Unlike MVC which uses a Http Module to process and hijack all requests, ServiceStack is built-on ASP.NET's raw IHttpHandler interfaces. This means ServiceStack must handle any request matching the ServiceStack handler path (e.g. / or /api) by returning an IHttpHandler and isn't able to Ignore them like they do in MVC.
You can however catch and handle all unhandled requests by registering a handler in IAppHost.CatchAllHandlers, e.g:
appHost.CatchAllHandlers.Add((httpMethod, pathInfo, filePath) => {
if (pathInfo.StartsWith("favicon"))
return new NotFoundHttpHandler();
});

Answer 3

Just to append to #antonydenyer's answer. His solution seems to work also when combining owin with servicestack3.
<handlers>
<add path="auth/*" name="Microsoft.Owin.Host.SystemWeb" type="Microsoft.Owin.Host.SystemWeb.OwinHttpHandler, Microsoft.Owin.Host.SystemWeb" verb="*" preCondition="integratedMode" resourceType="Unspecified" allowPathInfo="true" />
<add path="*" name="ServiceStack.Factory" type="ServiceStack.WebHost.Endpoints.ServiceStackHttpHandlerFactory, ServiceStack" verb="*" preCondition="integratedMode" resourceType="Unspecified" allowPathInfo="true" />
</handlers>
Here SS is handling every request except /auth. Auth is mapped to Identityserver3 using owin.