HttpApplication.Init method

HttpApplication class has a method  Init. It is virtual and called by ASP.NET runtime when initializing of a HttpApplication is almost finished i.e. all modules have been initialized and all event handlers in the Global.asax have been registered. It is also lat time when you can attach handlers to the HttpApplication events. The method is quite handy if you want to place your custom HttpApplication in a separate  class library project.

I’ve used it to see which modules are registered for an application and subscribed for the application events,  and how much time each stage of the request processing takes. The output looks like the following.

See attached file

Modules	HttpApplication event handlers	Timing
OutputCache Session WindowsAuthentication FormsAuthentication PassportAuthentication RoleManager UrlAuthorization FileAuthorization AnonymousIdentification Profile ErrorHandlerModule ServiceModel DefaultAuthentication	BeginRequest   ASP.global_asax.Application_BeginRequest AuthenticateRequest   System.Web.Security.WindowsAuthenticationModule.OnEnter   System.Web.Security.PassportAuthenticationModule.OnEnter DefaultAuthentication   System.Web.Security.DefaultAuthenticationModule.OnEnter PostAuthenticateRequest   System.ServiceModel.Activation.HttpModule.ProcessRequest AuthorizeRequest   System.Web.Security.UrlAuthorizationModule.OnEnter   System.Web.Security.FileAuthorizationModule.OnEnter ResolveRequestCache   System.Web.Caching.OutputCacheModule.OnEnter AcquireRequestState   System.Web.Profile.ProfileModule.OnEnter AcquireRequestStateAsync     System.Web.SessionState.SessionStateModule.BeginAcquireState     System.Web.SessionState.SessionStateModule.EndAcquireState ReleaseRequestState   System.Web.SessionState.SessionStateModule.OnReleaseState UpdateRequestCache   System.Web.Caching.OutputCacheModule.OnLeave EndRequest   System.Web.SessionState.SessionStateModule.OnEndRequest   System.Web.Security.PassportAuthenticationModule.OnLeave   System.Web.Profile.ProfileModule.OnLeave	Stage From BeginRequest From Last Stage ticks ms ticks ms BeginRequest AuthenticateRequest 13 .01 13 .01 DefaultAuthentication 20 .01 7 PostAuthenticateRequest 45 .02 25 .01 AuthorizeRequest 79 .04 34 .02 PostAuthorizeRequest 84 .04 5 ResolveRequestCache 91 .04 7 PostResolveRequestCache 96 .05 5 PostMapRequestHandler 179 .08 83 .04 AcquireRequestState 214 .1 35 .02 PostAcquireRequestState 220 .1 6 PreRequestHandlerExecute 225 .11 5 PostRequestHandlerExecute 309 .15 84 .04 ReleaseRequestState 318 .15 9 PostReleaseRequestState 323 .15 5 UpdateRequestCache 331 .16 8 PostUpdateRequestCache 336 .16 5 EndRequest 344 .16 8