MVC enable global after GZIP compression, abnormal page appear garbled, how to solve?

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MVC4

I wrote a compressed filter: CompressAttribute, set up a global filter, but there was a problem, whenever an exception is thrown, also will be compressed, so the page will appear garbled.
This is a regular file compression feature code

public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        object[] actionFilter = filterContext.ActionDescriptor.GetCustomAttributes(typeof(NoCompress), false);
        object[] controllerFilter = filterContext.ActionDescriptor.ControllerDescriptor.GetCustomAttributes(typeof(NoCompress), false);
        if (controllerFilter.Length == 1 || actionFilter.Length == 1)
        {
            return;
        }

        if (filterContext.HttpContext.Request.IsAjaxRequest())
        {
            return;
        }


        HttpRequestBase request = filterContext.HttpContext.Request;
        HttpResponseBase response = filterContext.HttpContext.Response; string acceptEncoding = request.Headers["Accept-Encoding"];
        if (acceptEncoding == null)
            return;

        if (acceptEncoding.ToLower().Contains("gzip"))
        {
            response.Filter = new GZipStream(response.Filter, compress);
            response.AppendHeader("Content-Encoding", "gzip");
        }
        else if (acceptEncoding.ToLower().Contains("deflate"))
        {
            response.Filter = new DeflateStream(response.Filter, compress);
            response.AppendHeader("Content-Encoding", "deflate");
        }
    }

I thought, inheritance IException interface implementations, whenever abnormal, I on GZIP compression decompression, but no effect, or still appear messy code problem. The following is my decompression code.

public void OnException(ExceptionContext filterContext)
    {
        string acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
        if (String.IsNullOrEmpty(acceptEncoding)) return;
        var response = filterContext.HttpContext.Response;
        acceptEncoding = acceptEncoding.ToUpperInvariant();
        var obj = new GZipStream(response.Filter, decompress);
        if (acceptEncoding.Contains("GZIP"))
        {
         //   response.AppendHeader("Content-Encoding", "gzip");
            response.Filter = obj;
        }
        else if (acceptEncoding.Contains("DEFLATE"))
        {
            //   response.AppendHeader("Content-Encoding", "deflate");
            response.Filter = new DeflateStream(response.Filter, decompress);
        }
    }

I don't know where I was wrong, ask everybody to help me，thank you!