Enable gzip/deflate compression

Question 1

If you want to enable compression globally across your API, another option is to do this:

Add this override to your AppHost:

public override IServiceRunner<TRequest> CreateServiceRunner<TRequest>(ActionContext actionContext)
{
    return new MyServiceRunner<TRequest>(this, actionContext);
}

Then implement that class like this:

public class MyServiceRunner<TRequest> : ServiceRunner<TRequest>
{
    public MyServiceRunner(IAppHost appHost, ActionContext actionContext) : base(appHost, actionContext)
    {
    }

    public override void OnBeforeExecute(IRequestContext requestContext, TRequest request)
    {
        base.OnBeforeExecute(requestContext, request);
    }

    public override object OnAfterExecute(IRequestContext requestContext, object response)
    {
        if ((response != null) && !(response is CompressedResult))
            response = requestContext.ToOptimizedResult(response);

        return base.OnAfterExecute(requestContext, response);
    }

    public override object HandleException(IRequestContext requestContext, TRequest request, Exception ex)
    {
        return base.HandleException(requestContext, request, ex);
    }
}

OnAfterExecute will be called and give you the chance to change the response. Here, I am compressing anything that is not null and not already compressed (in case I'm using ToOptimizedResultUsingCache somewhere). You can be more selective if you need to but in my case, I'm all POCO objects with json.

References

ServiceStack New Api

Question 2

For those interested, a partial answer to my own question, you can use the extension method ToOptimizedResult() or, if you are using caching ToOptimizedResultUsingCache().

For instance, returning a compressed result:

public class ArticleService : Service
{
  public object Get(Articles request) {
    return base.RequestContext.ToOptimizedResult( 
       new List<Articles> { 
            new Article {Ref = "SILVER01", Description = "Silver watch"},
            new Article {Ref = "GOLD1547", Description = "Gold Bracelet"}
       });
  }
}