Hi Shada,

We are using another approach. BasePage.cs:

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);

        GZipHelper.GZipEncodePage();
    }

GZipHelper.cs:

public class GZipHelper
{
    /// <summary>
    /// Sets up the current page or handler to use GZip through a Response.Filter
    /// IMPORTANT: 
    /// You have to call this method before any output is generated!
    /// </summary>
    public static void GZipEncodePage()
    {
        var response = HttpContext.Current.Response;

        if (IsGZipSupported())
        {
            var acceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"];
            if (acceptEncoding.Contains("deflate"))
            {
                response.Filter = new DeflateStream(response.Filter,
                                           CompressionMode.Compress);
                response.AppendHeader("Content-Encoding", "deflate");
            }
            else
            {
                response.Filter = new GZipStream(response.Filter,
                                          CompressionMode.Compress);
                response.AppendHeader("Content-Encoding", "gzip");
            }
        }

        // Allow proxy servers to cache encoded and unencoded versions separately
        response.AppendHeader("Vary", "Content-Encoding");
    }

    /// <summary>
    /// Determines if GZip is supported
    /// </summary>
    /// <returns></returns>
    public static bool IsGZipSupported()
    {
        string acceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"];

        if (string.IsNullOrEmpty(acceptEncoding)) return false;
        if (!acceptEncoding.Contains("gzip") && !acceptEncoding.Contains("deflate")) return false;

        var isPartial = HttpContext.Current.Request.Headers["x-microsoftajax"];

        //Just checking to see if this is a partial page update
        //See http://bit.ly/GlHfD for more info.

        return System.String.Compare("Delta=true", isPartial, System.StringComparison.OrdinalIgnoreCase) != 0;
    }

    public static void CompressFile(string inputFilePath, string resultFilePath)
    {
        FileStream sourceFileStream = File.OpenRead(inputFilePath);
        FileStream destFileStream = File.Create(resultFilePath);

        GZipStream compressingStream = new GZipStream(destFileStream,
            CompressionMode.Compress);

        byte[] bytes = new byte[2048];
        int bytesRead;
        while ((bytesRead = sourceFileStream.Read(bytes, 0, bytes.Length)) != 0)
        {
            compressingStream.Write(bytes, 0, bytesRead);
        }

        sourceFileStream.Close();
        compressingStream.Close();
        destFileStream.Close();
    }
}

Thanks,

Alex

Are you using asp.net ?

Shada, what IIS do you use ?

How do you test gzip response or not ?

Best,

Alex

Now I try write "ActionFilter" for compressing data in my SurfaceController:

using System.Web;
using System.Web.Mvc;

public class CompressFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(FilterExecutingContext filterContext)
    {
        HttpRequestBase request = filterContext.HttpContext.Request;

        string acceptEncoding = request.Headers["Accept-Encoding"];

        if (string.IsNullOrEmpty(acceptEncoding)) return;

        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);
        }
    }
} 

Use:

  [CompressFilter]
        public ActionResult FindOrganizations()

But the compression is still not happening! Below is response header in chrome.

Cache-Control:private
Content-Type:text/html; charset=utf-8
Date:Tue, 02 Feb 2016 12:45:52 GMT
Transfer-Encoding:chunked
X-MiniProfiler-Ids:["7f917847-6163-46b3-8777-85842e7288d8","66fb528e-5733-4df4-bed3-ee45dec04807","054cc610-f702-44cc-a73d-2d8f96cd9b6b","2bc268f4-b9ff-442a-b1e3-c8669eac3684"]

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