TestServer

Purpose

This simple test server was built to demonstrate a problem with serializing Exceptions and ResponseStatus objects when using ServiceStack and the References for Dart/Flutter. The problem was detected in a production project using .NETCore 3.1 and ServiceStack 5.2 on a Fedora 34 Workstation and RHEL docker containers.

Infrastructure

This server was created with the following settings / infrastructure

• Mac running the latest version of BigSur.
• It was built as .NET 5.0 self-hosting Kestrel Console App
• It is using ServiceStack 5.12.1

What is inside

This project is very primitive and has only one service. This service generates a list of 10 addresses and returns them as a list of objects.

How to produce the errors

In the AddressService.cs file comment lines to reproduce the problems:

    public class AddressService : Service
    {
        public object Get(GetAddressList request)
        {
            var addresses = TryResolve<AddressData>();

            //throw new Exception("This is a fake EXCEPTION for testing error handling in DART");
            
            return new GetAddressListResponse()
            {
                Addresses = addresses.Addresses,
                ResponseStatus = new ResponseStatus("500", "This is a fake message for testing!"),
            };
        }

    }

• To run normally without errors leave the code as shown above.
• To show an empty exception uncomment //throw new Exception("This is a fake EXCEPTION for testing error handling in DART"); to throw an exception in the Flutter client. You will see the exception but the text This is a fake EXCEPTION ... will appear nowhere.
• To show a NULL ResponseStatus object in the GetAddressListResponse object, comment the code look like

            //throw new Exception("This is a fake EXCEPTION for testing error handling in DART");
            
            return new GetAddressListResponse()
            {
                //Addresses = addresses.Addresses,
                Status = new ResponseStatus("500", "This is a fake message for testing!"),
            };

In the flutter project all members of the GetAddressListResponse object are null.