testattr.cs

namespace testattr
{
    using System;
    using Funq;
    using ServiceStack;
    using ServiceStack.Web;
    using ServiceStack.Text;

    class AppHost : AppSelfHostBase
    {
        public AppHost() : base("AttributeTest", typeof(AppHost).Assembly) { }

        public override void Configure(Container container) { }
    }

    [AttributeUsage(AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
    class TestAttribute : RequestFilterAttribute
    {
        public override void Execute(IRequest req, IResponse res, object requestDto)
        {
            throw new Exception("attribute was executed");
        }
    }

    [Route("/test/without/attribute")]
    class TestWithout : IReturnVoid { }

    [Route("/test/with/attribute")]
    class TestWith : IReturnVoid { }

    class TestService : Service
    {
        public void Get(TestWithout request)
        {
            using(var svc = base.ResolveService<TestService>())
            {
                svc.Get(new TestWith());
            }
        }

        [Test]
        public void Get(TestWith request)
        {
        }
    }

    class MainClass
    {
        public static void Main (string[] args)
        {
            new AppHost().Init().Start("http://localhost:9090/");
            "Started apphost on port 9090".Print();

            using(var client = new JsonServiceClient("http://localhost:9090"))
            {
                "Calling /test/without/attribute...".Print();
                client.Get<IReturnVoid>("/test/without/attribute");

                "Calling /test/with/attribute...".Print();
                client.Get<IReturnVoid>("/test/with/attribute");
            }
        }
    }
}

Output:

[rudism@rudxgx testattr]$ mono --debug bin/Debug/testattr.exe
Started apphost on port 9090
Calling /test/without/attribute...
Calling /test/with/attribute...

Unhandled Exception:
ServiceStack.WebServiceException: Exception
  at ServiceStack.ServiceClientBase.ThrowWebServiceException[ErrorResponse] (System.Exception ex, System.String requestUri) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.ThrowResponseTypeException[IReturnVoid] (System.Object request, System.Exception ex, System.String requestUri) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.HandleResponseException[IReturnVoid] (System.Exception ex, System.Object request, System.String requestUri, System.Func`1 createWebRequest, System.Func`2 getResponse, IReturnVoid& response) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.Send[IReturnVoid] (System.String httpMethod, System.String relativeOrAbsoluteUrl, System.Object request) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.Get[IReturnVoid] (System.String relativeOrAbsoluteUrl) [0x00000] in <filename unknown>:0
  at testattr.MainClass.Main (System.String[] args) [0x00064] in /home/rudism/source/testattr/Program.cs:60
[ERROR] FATAL UNHANDLED EXCEPTION: ServiceStack.WebServiceException: Exception
  at ServiceStack.ServiceClientBase.ThrowWebServiceException[ErrorResponse] (System.Exception ex, System.String requestUri) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.ThrowResponseTypeException[IReturnVoid] (System.Object request, System.Exception ex, System.String requestUri) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.HandleResponseException[IReturnVoid] (System.Exception ex, System.Object request, System.String requestUri, System.Func`1 createWebRequest, System.Func`2 getResponse, IReturnVoid& response) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.Send[IReturnVoid] (System.String httpMethod, System.String relativeOrAbsoluteUrl, System.Object request) [0x00000] in <filename unknown>:0
  at ServiceStack.ServiceClientBase.Get[IReturnVoid] (System.String relativeOrAbsoluteUrl) [0x00000] in <filename unknown>:0
  at testattr.MainClass.Main (System.String[] args) [0x00064] in /home/rudism/source/testattr/Program.cs:60