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Server 2008 R2 SP1 issue

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Compression

This is a migrated thread and some comments may be shown as answers.

Caesar asked on 28 Feb 2011, 10:51 PM

Hi,

After applying SP1 for Server 2008 R2 (or SP1 for Windows 7), we started to receive errors when using RadCompression.

The issue only occurs when calling web-services. The web-service call actually works but there is always an exception that is handled in Application_Error, and since we have centralized our error handling, an error is logged for each web-service call. Before SP1 there were no errors!!!

The exception is:
System.Web.HttpException (0x80004005): Server cannot append header after HTTP headers have been sent.
   at System.Web.HttpResponse.AppendHeader(String name, String value)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

To reproduce the exception:
Create new web application, add a page with the following code:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication4.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

<script runat="server">

Sub rg_NeedDataSource(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles rg.NeedDataSource

Dim dt As New System.Data.DataTable()

dt.Columns.Add("Col1", GetType(String))

dt.Columns.Add("Col2", GetType(String))

For i As Integer = 0 To 10

dt.Rows.Add({"Row" & i, "Data"})

Next

rg.DataSource = dt

End Sub

</script>

<script type="text/javascript">

function callWebService()

{

$telerik.$.ajax({

type: 'POST',

url: 'WebService1.asmx/HelloWorld',

contentType: 'application/json; charset=utf-8',

dataType: 'json'

});

}

</script>

</head>

<body>

<form id="form1" runat="server">

<asp:ScriptManager ID="ScriptManager" runat="server">

</asp:ScriptManager>

<div>

<telerik:RadGrid ID="rg" runat="server" AutoGenerateColumns="true" Width="100%">

<ClientSettings>

<Scrolling AllowScroll="true" ScrollHeight="281px" UseStaticHeaders="true" />

</ClientSettings>

</telerik:RadGrid>

<asp:Button ID="aaa" runat="server" Text="callWebService" OnClientClick="callWebService(); return false;" />

</div>

</form>

</body>

</html>

Add a web-service with the following code-behind:

Imports System.Web.Services

Imports System.Web.Services.Protocols

Imports System.ComponentModel

<System.Web.Script.Services.ScriptService()>

Public Class WebService1

Inherits System.Web.Services.WebService

<WebMethod()> _

Public Function HelloWorld() As String

Return "Hello World"

End Function

End Class

web.config System.webServer section:

<system.webServer>

<modules runAllManagedModulesForAllRequests="true">

<remove name="RadCompression" />

<add name="RadCompression" preCondition="managedHandler" type="Telerik.Web.UI.RadCompression" />

</modules>

</system.webServer>

Deploy the web application to an IIS web application!
Important!!! it must run in a "real" IIS web application and not the Visual Studio built in web server.

When pressing the button, an error on the server will always occur (even as the web service works!!!).
You can see the exception when attaching to the IIS and setting a break-point in Global.asax.vb on the Application_Error line (or logging the error here).

Regards
Caesar

15 Answers, 1 is accepted

answered on 07 Mar 2011, 08:56 AM

Hi,

The problem isn't that there are errors logged automatically in the IIS log file. The exception is caught by Application_Error in Global.asax!
We have made a centralized error handling that logs all errors in the Application_Error event, this is where the exception turns up after applying SP1:

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)

' Fires when an error occurs

DoSomeLogging()

End Sub

To reproduce the error you will have to do some kind of logging in this event, or run in debug and set a breakpoint in this event.
The strange thing is that the webservice actually works and get called correctly. Our problem is that when logging all errors in this event, there will be thousands of errors in a day in our application, and this wasn't a problem before SP1. All our installed instances suffered from this the day after SP1 was applied.

Important!!! It must run in a "real" IIS web application and not the Visual Studio built in web server.

Regards
Caesar

answered on 07 Mar 2011, 12:52 PM

WebSite12.zip

Hi Caesar,

Thank you for the additional explanation. However I am still unable to replicate the behavior. I am attaching a test website which works as expected on my end. I hosted it on IIS 7.5 on Windows 7 machine with installed SP1, using a 4.0 application pool in Integrated mode. Please let me know what I may be missing.

All the best,
Pavel
the Telerik team

Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat for a walk through all the exciting stuff we ship with the new release!

Accepted

answered on 08 Mar 2011, 03:08 PM

CompressionWorkaround.zip

Hello Caesar,

Thank you for the additional details. We were able to replicate the problem and can suggest you the following workaround. You can create your own module, which inherits from RadCompression and add the following to it:

Copy Code

namespace MyNamespace

{

public class CustomModule1 : RadCompression

{

protected override bool ShouldExclude(string handlerPath)

{

if (String.Compare(HttpContext.Current.CurrentHandler.GetType().FullName, "System.Web.Handlers.TransferRequestHandler") == 0)

return true;

return base.ShouldExclude(handlerPath);

}

Then you can register the module in web.config like this:

Copy Code

<system.webServer>

<modules >

<add name="CustomModule1" type="MyNamespace.CustomModule1" preCondition="managedHandler"/>

</modules>

</system.webServer>

I am attaching a sample test page for reference. Our developers will continue to investigate a possible solution within our module. I have also updated your Telerik points for your involvement.

All the best,
Pavel
the Telerik team

answered on 11 Mar 2011, 08:35 PM

Hello,

I can confirm that precisely this is also happening on our site since the installation of SP1. It has been driving me nuts. I was trying to localise it again when I found this thread. Caesar, how did you figure out it is the Telerik RadCompression code? This is what our messages look like:

ERROR 2011-03-11 20:24:09,395 83.170.113.102 83.170.113.102 2011-03-10T02:26:53-796 [857] 85357443ms Global                 Application_Error                - Last Chance Handler., ExType=System.Web.HttpException, InnerExType=none, Exception = System.Web.HttpException (0x80004005): Server cannot append header after HTTP headers have been sent.
   at System.Web.HttpResponse.AppendHeader(String name, String value)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Telerik Support: WILL YOU PLEASE CONFIRM that the fix will be supplied in the next release so we don 't have to go patching around. I can just ignore this exception in my Global.asax.cs until then.

Thanks again!
R

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Server 2008 R2 SP1 issue

15 Answers, 1 is accepted