压缩请求数据（优化页面加载太慢之一）

    /// <summary>
    /// 允许压缩
    /// </summary>
    public class AllowCompressAttribute : System.Web.Mvc.ActionFilterAttribute
    {
        /// <summary>
        /// 压缩方法
        /// </summary>
        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            string acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
            if (String.IsNullOrEmpty(acceptEncoding)) return;
            var response = filterContext.HttpContext.Response;
            acceptEncoding = acceptEncoding.ToUpperInvariant();
            //查看客户端是否支持压缩
            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);
            }
            base.OnResultExecuting(filterContext);
        }
    }