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Problem with centralized error handling, Application_Error

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Compression

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

Caesar asked on 19 May 2011, 01:37 PM

Hi,

We have done the following:
In Appliction_Error and in ScriptManager_AsyncPostBackError, we handle and logs the exception.
Then we redirect to an error page.

When not using radcompression, this works for all cases, but when using radcompression, the redirect doesn't happen when an exception occurs in Page_PreInit. The exception must also be in an Async callback, normal postbacks works as expected.

Default.aspx:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="default.aspx.vb" Inherits="WebApplication8._default" %>

<!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>

</head>

<body>

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

<div>

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

<asp:UpdatePanel ID="upError" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional">

<ContentTemplate>

<asp:Button ID="btnError" runat="server" Text="Error" />

</ContentTemplate>

</asp:UpdatePanel>

<asp:Button ID="btnErrorNoUpdatePanel" runat="server" Text="ErrorNoUpdatePanel" />

</div>

</form>

</body>

</html>

Default.aspx.vb:

Public Class _default

Inherits System.Web.UI.Page

Private Sub _default_PreInit(sender As Object, e As System.EventArgs) Handles Me.PreInit

If Me.IsPostBack Then

Throw New Exception("Test")

End If

End Sub

Private Sub sm_AsyncPostBackError(sender As Object, e As System.Web.UI.AsyncPostBackErrorEventArgs) Handles sm.AsyncPostBackError

Server.ClearError()

Response.Redirect("Error.aspx")

End Sub

End Class

Error.aspx:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Error.aspx.vb" Inherits="WebApplication8._Error" %>

<!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>

</head>

<body>

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

<div>

An error occured!

</div>

</form>

</body>

</html>

web.config:

<?xml version="1.0"?>

<configuration>

<system.web>

<customErrors mode="Off"/>

<compilation debug="true" strict="false" explicit="true" targetFramework="4.0" />

<httpModules>

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

</httpModules>

</system.web>

<system.webServer>

<modules runAllManagedModulesForAllRequests="true">

<remove name="RadCompression" />

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

</modules>

</system.webServer>

</configuration>

Global.asax.vb:

Imports System.Web.SessionState

Public Class Global_asax

Inherits System.Web.HttpApplication

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

' Fires when an error occurs

Server.ClearError()

Response.Redirect("Error.aspx")

End Sub

End Class

When hitting the Error-button, I don't get to the error page, but when hitting the ErrorNoUpdatePanel I do get to the error page.
If turning off RadCompression both cases works.

Regards
Caesar

2 Answers, 1 is accepted

Accepted

answered on 20 May 2011, 08:53 AM

Hi Caesar,

Calling Response.Redirect() at such late stage causes an exception as the appropriate response header cannot be added nor changed. As a result this prevents adding the compression content-encoding header and the browser is not able to decode the response from the server. As a workaround I can suggest you to call the Redirect() in the OnError handler of the Page.

Best wishes,
Pavel
the Telerik team

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