Custom error pages in servicestack - servicestack

Question

How do I configure ServiceStack to serve specific error pages (404, 500, etc.) depending on the type of error being returned?
Currently, I'm using the RawHttpHandler below code to ensure that a request for a HTML file is authenticated. However, if the user specifies a non-existent file or endpoint, how can I have it return my 404.html page.
this.RawHttpHandlers.Add(httpReq =>
{
var session = httpReq.GetSession();
if(!session.IsAuthenticated) {
var isHtmlFileRequest = httpReq.PathInfo.EndsWith(".html");
if(isHtmlFileRequest && !files.Any(s => httpReq.PathInfo.ToLower().Contains(s))) {
return new RedirectHttpHandler {
AbsoluteUrl = "/Login.html"
};
}
}
return null;
});

Answer 1

The Error Handling wiki shows different ways to Customize Handling of Exceptions in ServiceStack, e.g you can redirect 404 errors to /404.cshtml with:
public override void Configure(Container container)
{
this.CustomHttpHandlers[HttpStatusCode.NotFound] =
new RazorHandler("/404");
}
CustomHttpHandlers can be any IServiceStackHandler which is just a HttpHandler that supports both ASP.NET and HttpListener requests. The easiest way to create one is to just inherit from IServiceStackHandler. Here's an example of a Custom Static File Handler similar to StaticFileHandler except it only writes the specified filePath instead of using the HTTP Request path:
public class CustomStaticFileHandler : HttpAsyncTaskHandler
{
string filePath;
public CustomStaticFileHandler(string filePath)
{
this.filePath = filePath;
}
public override void ProcessRequest(HttpContextBase context)
{
var httpReq = context.ToRequest(GetType().GetOperationName());
ProcessRequest(httpReq, httpReq.Response, httpReq.OperationName);
}
public override void ProcessRequest(IRequest request, IResponse response,
string operationName)
{
response.EndHttpHandlerRequest(skipClose: true, afterHeaders: r =>
{
var file = HostContext.VirtualPathProvider.GetFile(filePath);
if (file == null)
throw new HttpException(404, "Not Found");
r.SetContentLength(file.Length);
var outputStream = r.OutputStream;
using (var fs = file.OpenRead())
{
fs.CopyTo(outputStream, BufferSize);
outputStream.Flush();
}
}
}
}
This can then be registered as normal, i.e:
public override void Configure(Container container)
{
this.CustomHttpHandlers[HttpStatusCode.NotFound] =
new CustomStaticFileHandler("/404.html");
}