Compression does not work with UpdatePanel 2

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Compression does not work with UpdatePanel 2

Last post 10-21-2008 8:00 AM by zhornykUN. 2 replies.

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Compression does not work with UpdatePanel 2

08-21-2007, 6:03 PM

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zhornyk
Joined on 05-21-2007, 5:54 AM
Posts 10
Points 13

I'm using HttpModule for comression (GZipStream) . It works fine but there is strange error after async request from UpdatePanel : "The message received from the server control could not be parsed....."

After debugging Web.Extensions' javascript (clientside AJAX) I've found that sometimes decompressed response from server does not contain one or several last symbols. So clientside AJAX cannot parse it.

Here you can read that this is known issue with GZIp and UpdatePanel:

http://www.thescripts.com/forum/thread670482.html

http://brennan.offwhite.net/blog/2007/06/20/http-compression-with-ajax

But I cannot believe that MS may commit such awful bug.

Maybe I'm doing something incorrect on serverside?

I really don't want to change Web.Extensions manually and recompile it to add missing symbols...

Here is my server code:

<add name="CompressionModule" type="WebSite.CompressionModule" />

</httpModules>

#region Using

using System;

using System.Web;

using System.IO;

using System.IO.Compression;

#endregion

namespace WebSite

{

/// <summary>

/// Compresses the output using standard gzip/deflate.

/// </summary>

public class CompressionModule : IHttpModule

{

public void Init(HttpApplication context)

{

context.BeginRequest += new EventHandler(context_BeginRequest);

}

private void context_BeginRequest(object sender, EventArgs e)

{

HttpApplication app = (HttpApplication)sender;

if (app.Request.Url.ToString().ToLower().IndexOf("aspx") < 0) return;

string encodings = app.Request.Headers.Get("Accept-Encoding");

if (encodings == null) return;Stream baseStream = app.Response.Filter;

encodings = encodings.ToLower();

if (encodings.Contains("gzip"))

{

app.Response.Filter = new GZipStream(baseStream,

CompressionMode.Compress);

app.Response.AppendHeader("Content-Encoding", "gzip");

}

else if (encodings.Contains("deflate"))

{

app.Response.Filter = new DeflateStream(baseStream,

CompressionMode.Compress);

app.Response.AppendHeader("Content-Encoding", "deflate");

}

public void Dispose()

{

}

Please help me.

Andriy Zhornyk
http://www.jetideas.com

Re: Compression does not work with UpdatePanel 2

10-21-2008, 7:18 AM

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d.marzo
Joined on 10-21-2008, 11:11 AM
Posts 1
Points 2

This is a bug (nasty), compress update panel response its high performance improvement,
reported at Microsoft Connect: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=357565

Expected to be fixed at 3.5.

But... Too much people work with 2.0 (include us), and dont want compress at IIS level.

We play for a while and try to find a workaround, we found, but we need feedback and advice.

You could see description at:

https://connect.microsoft.com/VisualStudio/feedback/Workaround.aspx?FeedbackID=357565

And download source code:

http://www.solnatec.com/archive/public/2008/CompressAjaxResponse.zip

Thanks in advance.

David Marzo
www.solnatec.com