MVC 4 - GZIP compression of JSON ajax action result [duplicate]

Okay, so it would seem I need to do something in my controller also:

As per the below extracted from: how to gzip content in asp.net MVC?

public class CompressAttribute : ActionFilterAttribute{    public override void OnActionExecuting(ActionExecutingContext filterContext)    {        var encodingsAccepted = filterContext.HttpContext.Request.Headers["Accept-Encoding"];        if (string.IsNullOrEmpty(encodingsAccepted)) return;        encodingsAccepted = encodingsAccepted.ToLowerInvariant();        var response = filterContext.HttpContext.Response;        if (encodingsAccepted.Contains("deflate"))        {            response.AppendHeader("Content-encoding", "deflate");            response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);        }        else if (encodingsAccepted.Contains("gzip"))        {            response.AppendHeader("Content-encoding", "gzip");            response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);        }    }

usage in controller:

[Compress]public class BookingController : BaseController{...}