How Debugging Source Symbols

ServiceStack Debugging
2

and I have a qustion : I don’t add AuthFeature to Plugins, when I visitd a ServiceStackController marked ‘Authenticate’ ,
it redirect to ‘/logon’ (may be a mistake in mvc5 project it should be /api/logon ?) but the source at ‘AuthenticateAttribute’ is

    public override void Execute(IRequest req, IResponse res, object requestDto)
        {
            if (AuthenticateService.AuthProviders == null)
                throw new InvalidOperationException(
                    "The AuthService must be initialized by calling AuthService.Init to use an authenticate attribute");

            if (HostContext.HasValidAuthSecret(req))
                return;

            var matchingOAuthConfigs = AuthenticateService.AuthProviders.Where(x =>
                this.Provider.IsNullOrEmpty()
                || x.Provider == this.Provider).ToList();

            if (matchingOAuthConfigs.Count == 0) //I think this should be true if I don't add AuthFeature so AuthProviders count=0
            {
                res.WriteError(req, requestDto, $"No OAuth Configs found matching {this.Provider ?? "any"} provider");
                res.EndRequest();
                return;
            }
......
}