Custom exception handling in ServiceStack REST service

Question

I have a ServiceStack REST service and I need to implement custom error handling. I\'ve been able to customize service errors by setting AppHostBase.ServiceExceptionHandler

Answer 1

The AppHostBase.ServiceExceptionHandler global handler only handles service exceptions. To handle exceptions occurring outside of services you can set the global AppHostBase.ExceptionHandler handler, e.g:

public override void Configure(Container container)
{
    //Handle Exceptions occurring in Services:
    this.ServiceExceptionHandler = (request, exception) => {

        //log your exceptions here
        ...

        //call default exception handler or prepare your own custom response
        return DtoUtils.HandleException(this, request, exception);
    };

    //Handle Unhandled Exceptions occurring outside of Services, 
    //E.g. in Request binding or filters:
    this.ExceptionHandler = (req, res, operationName, ex) => {
         res.Write("Error: {0}: {1}".Fmt(ex.GetType().Name, ex.Message));
         res.EndServiceStackRequest(skipHeaders: true);
    };
}

To create and serialize a DTO to the response stream in the non-service ExceptionHandler you would need to access and use the correct serializer for the request from IAppHost.ContentTypeFilters.

More details about is in the Error Handling wiki page.