/// <summary>

    /// Gzip 压缩

    /// </summary>

    public sealed class CompressionFilter : IResultFilter

    {

        public void OnResultExecuted(ResultExecutedContext filterContext)

        {

        }

        public void OnResultExecuting(ResultExecutingContext filterContext)

        {

            string acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];

            if (!String.IsNullOrEmpty(acceptEncoding))

            {

                acceptEncoding = acceptEncoding.ToUpperInvariant();

                HttpResponseBase response = filterContext.HttpContext.Response;

                if (acceptEncoding.Contains("GZIP"))

                {

                    response.AppendHeader("Content-encoding", "gzip");

                    response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);

                }

                else if (acceptEncoding.Contains("DEFLATE"))

                {

                    response.AppendHeader("Content-encoding", "deflate");

                    response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);

                }

            }

        }

    }