HTTP Modules’ Events and Their Order of Firing

Below is the list of Events raised by HttpHandlers. These events are in the sequence of firing.

OnBeginRequest
OnAuthenticateRequest
OnPostAuthenticateRequest
OnAuthorizeRequest
OnPostAuthorizeRequest
OnResolveRequestCache
OnPostResolveRequestCache
OnPostMapRequestHandler
OnAcquireRequestState
OnPostAcquireRequestState
OnPreRequestHandlerExecute
Page_Load Event of the Page
OnPostRequestHandlerExecute
OnReleaseRequestState
OnPostReleaseRequestState
OnUpdateRequestCache
OnPostUpdateRequestCache
OnEndRequest
OnPreSendRequestHeaders

I wrote a http handler to check the sequence of execution of event handlers. Below is the program. Two events in the program are commented because these require integration with the IIS pipeline. I used Visual Web Developer 2008 Express Edition Beta 2 to write this program. So may be express edition does not support integration with IIS. I haven’t checked it yet. Here is the program:

using System;

using System.Data;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Xml.Linq;

/// <summary>

/// Summary description for AddSign

/// </summary>

public class AddSign: IHttpModule

{

public delegate void MyEventHandler(Object s, EventArgs e);

private MyEventHandler _eventHandler = null;

public event MyEventHandler MyEvent

{

add { _eventHandler += value; }

remove { _eventHandler -= value; }

}

public AddSign()

{

//

// TODO: Add constructor logic here

//

}

#region IHttpModule Members

void IHttpModule.Dispose()

{

//throw new NotImplementedException();

}

void IHttpModule.Init(HttpApplication context)

{

//throw new NotImplementedException();

context.EndRequest += new EventHandler(OnEndRequest);

context.AcquireRequestState += new EventHandler(OnAcquireRequestState);

context.AuthenticateRequest += new EventHandler(OnAuthenticateRequest);

context.AuthorizeRequest += new EventHandler(OnAuthorizeRequest);

context.BeginRequest += new EventHandler(OnBeginRequest);

context.Disposed += new EventHandler(OnDisposed);

context.Error += new EventHandler(OnError);

//context.LogRequest += new EventHandler(OnLogRequest); //This operation requires IIS integrated pipeline mode.

//context.MapRequestHandler += new EventHandler(OnMapRequestHandler); //This operation requires IIS integrated pipeline mode.

context.PostAcquireRequestState += new EventHandler(OnPostAcquireRequestState);

context.PostAuthenticateRequest += new EventHandler(OnPostAuthenticateRequest);

context.PostAuthorizeRequest += new EventHandler(OnPostAuthorizeRequest);

context.PostMapRequestHandler += new EventHandler(OnPostMapRequestHandler);

context.PostReleaseRequestState += new EventHandler(OnPostReleaseRequestState);

context.PostRequestHandlerExecute += new EventHandler(OnPostRequestHandlerExecute);

context.PostResolveRequestCache += new EventHandler(OnPostResolveRequestCache);

context.PostUpdateRequestCache += new EventHandler(OnPostUpdateRequestCache);

context.PreRequestHandlerExecute += new EventHandler(OnPreRequestHandlerExecute);

context.PreSendRequestContent += new EventHandler(OnPreSendRequestContent);

context.PreSendRequestHeaders += new EventHandler(OnPreSendRequestHeaders);

context.ReleaseRequestState += new EventHandler(OnReleaseRequestState);

context.ResolveRequestCache += new EventHandler(OnResolveRequestCache);

context.UpdateRequestCache += new EventHandler(OnUpdateRequestCache);

}

#endregion

public void OnEndRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnEndRequest<br />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnAcquireRequestState(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnAcquireRequestState”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnAuthenticateRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnAuthenticateRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnAuthorizeRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnAuthorizeRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnBeginRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnBeginRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnDisposed(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnDisposed”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnError(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnError”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

app.Context.Response.Write(“<BR />”);

_eventHandler(this, null);

}

public void OnLogRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnLogRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnMapRequestHandler(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnMapRequestHandler”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostAcquireRequestState(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostAcquireRequestState”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostAuthenticateRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostAuthenticateRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostAuthorizeRequest(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostAuthorizeRequest”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostMapRequestHandler(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostMapRequestHandler”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostReleaseRequestState(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostReleaseRequestState”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostRequestHandlerExecute(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostRequestHandlerExecute”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostResolveRequestCache(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostResolveRequestCache”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPostUpdateRequestCache(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPostUpdateRequestCache”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPreRequestHandlerExecute(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPreRequestHandlerExecute”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPreSendRequestContent(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPreSendRequestContent”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnPreSendRequestHeaders(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnPreSendRequestHeaders”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnReleaseRequestState(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnReleaseRequestState”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnResolveRequestCache(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnResolveRequestCache”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

public void OnUpdateRequestCache(Object s, EventArgs e)

{

HttpApplication app = s as HttpApplication;

app.Context.Response.Write(“OnUpdateRequestCache”);

app.Context.Response.Write(“<BR />”);

if (_eventHandler != null)

_eventHandler(this, null);

}

}

visit http://yaneshtyagi.com for more details.

(c) Yanesh Tyagi.

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