web api 压缩

using System.Web.Http.Filters;
using System;
using System.Net.Http.Headers;
using System.Text;
using System.Collections.Generic;
using System.Web.Http;
using System.Web.Http.Controllers;
using System.Linq.Expressions;
using System.Linq;
using System.Reflection;
using System.Collections;
using System.Threading;
using System.Net.Http.Formatting;
using System.Net;
using System.Threading.Tasks;
using System.Runtime.Caching;
using System.IO;
using Ionic.Zip;
using System.Net.Http;


namespace Compress
{
    public class DeflateCompressionAttribute : System.Web.Http.Filters.ActionFilterAttribute
    {
        public override void OnActionExecuted(HttpActionExecutedContext actContext)
        {
            var content = actContext.Response.Content;
            var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result;
            var zlibbedContent = bytes == null ? new byte[0] :
            CompressionHelper.DeflateByte(bytes);
            actContext.Response.Content = new ByteArrayContent(zlibbedContent);
            actContext.Response.Content.Headers.Remove("Content-Type");
            actContext.Response.Content.Headers.Add("Content-encoding", "gzip");
            actContext.Response.Content.Headers.Add("Content-Type", "application/json");
            base.OnActionExecuted(actContext);
        }
    }

    public class CompressionHelper
    {
        public static byte[] DeflateByte(byte[] str)
        {
            if (str == null)
            {
                return null;
            }

            using (var output = new MemoryStream())
            {
                using (
                    var compressor = new Ionic.Zlib.GZipStream(
                    output, Ionic.Zlib.CompressionMode.Compress,
                    Ionic.Zlib.CompressionLevel.BestSpeed))
                {
                    compressor.Write(str, 0, str.Length);
                }

                return output.ToArray();
            }
        }
    }

    // [DeflateCompressionAttribute]
        //public ActionResult Index()
        //{
        //    return View();
        //}


}