I get a 500 page instead of a ResponseStatus from exceptions within ServiceStack Service - servicestack

Question

Using ServiceStack 4.0.33 and given the following simplified DTOs...
[Route("/products")]
[Route("/products/{Id}")]
public class Product : IReturn<ProductResponse>
{
[PrimaryKey]
public string Id { get; set; }
public string Description { get; set; }
}
public class ProductResponse
{
public Product Product { get; set; }
}
with the following simplified service...
public class ProductService : Service
{
public object Post(Product product)
{
Db.Insert<Product>(product);
return new ProductResponse() { Product = product };
}
}
and calling it via this in my ProductsController
using (var productService = ResolveService<ProductService>())
{
var result = productService.Post(product);
if (result.IsErrorResponse())
return View(product);
else
return RedirectToAction("Index");
}
If I try to post a new Product with an intentional duplicate primary key, I get a 500 error HTML-style page instead of the ResponseStatus getting populated and returned...
I've seen lots of different StackOverflow posts about different reasons that ResponseStatus won't get populated, but I've tried several things to no avail. Am I missing something (hopefully simple)?

Answer 1

Where do you define the behavior that a duplicate key would be handled differently than HTTP 500. What other response would you expect? ResponseStatus can contain HTTP 500 which merely indicates a server-side error.
You have to specifically define that you want to handle the error differently and if so what type of error you want (which error code, which message) as explained here.
For instance:
public object Get(User request)
{
throw HttpError.NotFound("User {0} does not exist".Fmt(request.Name));
}
Check out the ServiceStack tutorial for more.

Answer 2

The error page you're getting is a custom ASP.NET Error page which hijacks any custom 500 HTTP error responses returned by your ASP.NET web application.
It can be disabled with:
<system.web>
...
<customErrors mode="Off" />
</system.web>
<system.webServer>
<httpErrors errorMode="Detailed" />
</system.webServer>
Here's another alternative of disabling IIS errors by setting TrySkipIisCustomErrors = true which in ServiceStack can be set with:
GlobalRequestFilters.Add((req, res, dto) =>
{
((HttpResponse)res.OriginalResponse).TrySkipIisCustomErrors = true;
});