ASPNET Pipeline SreedharKoganti

8/6/2019 ASPNET Pipeline SreedharKoganti

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ASP.NET Pipeline

(HttpModule andHttpHandler)

Sreedhar Koganti

Microsoft MVP (ASP.NET)http://weblogs.asp.net/skogantiContact: http://weblogs.asp.net/skoganti/contact.aspx

--- http://www.w3coder.com


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Agenda

Request Process Pipeline architecture intro

Good to know HttpRuntime Architecture

Meet Global.asax, HttpModule

Take advantage of HttpModule

Understand HttpHandler

Meet Lengthy process Life saver

Asynchronous HttpHandlerQ & A


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Request Process Pipelinearchitecture intro

Request Process Pipelinearchitecture intro

HTTP.SYSHTTP.SYS

Worker process identity (w3wp.exe)Worker process identity (w3wp.exe)

aspnet_isapiaspnet_isapi

User Mode

Kernel Mode

CLR/HttpRuntimeCLR/HttpRuntime

AppDomain

CodeCamp/Pipelinetest.aspx


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IIS and ASP.NET

.NET extensions are configured to behandled by aspnet_isapi.dll


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Peal it and see inside thepipeline


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Architecture

HttpHandlers

HttpModulesHtt

pR

un

time

Htt

pR

un

time

.asmx.asmx .aspx.aspx .ashx.ashx

OutputCacheOutputCache

AuthenticationAuthentication

SessionStateSessionState

Process BoundaryProcess Boundary

Htt

pC

on

tex

t

CodeCamp/Pipelinetest.aspx


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HttpRuntime is Logical replacement for ISAPI APIHttpRuntime forwards requests to HttpApplication

Here starts the storyHttpRuntime interns calls:

HttpContext

HttpHandler

HttpModule

Architecture


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. ,HttpModule

Events are fired at several stages in theprocessing of requests and responses pass

through the pipelineYou can handle these events either inHttpApplication (global.asax) or in IHttpModuleinterface

Functionality of global.asax and modulesoverlap

ASP.NET had its own modules

Session State HttpModule

Forms Authentication HttpModule

Output Cache HttpModule

Global.asax supports extra events like

Application_Start and Application_EndSession Start and Session End


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Global.asax/HttpModule

Demo

P R t A li ti


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Per-Request ApplicationEvents

BeginRequestAuthenticateRequestAuthorizeRequestResolveRequestCache

AquireRequestStatePreRequestHandlerExecuteTarget Handler ExecutionPostRequestHandlerExecute

ReleaseRequestStateUpdateRequestCacheEndRequest

T k d t f


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Take advantage ofHttpModule

Class must implement interface:System.Web.IHttpModule

Init()

Called when module is createdRegister delegates for runtime events

Dispose()

public interface IHttpModule {public interface IHttpModule {

public void Init(HttpApplication application);public void Init(HttpApplication application);

public void Dispose();public void Dispose();

}}

R i t i


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Registering anHttpModule

Compile into .NET assembly

Deploy

Into applications \bin directory or

Register in the GAC

Register in configuration:


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Real-time HttpModuleexamples

Demo


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Creating anHttpHandler

Class must implement interface:System.Web.IHttpHandler

ProcessRequest()

Main method of the handler

IsReusable { get; }

Indicates whether pooling is supported

public interface IHttpHandler {public interface IHttpHandler {

public void ProcessRequest(HttpContext context);public void ProcessRequest(HttpContext context);

public bool IsReusable();public bool IsReusable();}}

R i t i


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Registering anHttpHandler

Compile into .NET assembly

Deploy

Into applications \bin directory or

Register in the GAC

Register in configuration:

Important: Extension must be mapped in IIS

type="class, assembly" />


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Real-time HttpHandlerexamples

Demo


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Meet Lengthy process Lifesaver Asynchronous

HttpHandler

Same as normal handler in implimentation.

It implements using IHttpAsyncHandler

IhttpAsyncHandler is derived fromIhttpHandler

p s nc an er


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p sync an erImplimentation

public class ImageAsyncHandler : IHttpAsyncHandler{

public ImageAsyncHandler(){ }public IAsyncResult BeginProcessRequest(HttpContext context,

AsyncCallback cb, object extraData){ }

public void EndProcessRequest(IAsyncResult result){

HttpContext context = (HttpContext)result.AsyncState;

}public bool IsReusable

{get { return true; }

}public void ProcessRequest(HttpContext context){ }

}


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ea - meIHttpAsyncHandler

examples

Demo


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Its Your time.Want to learn more? here are some references..

Have Questions: Visit http://forums.asp.net/

See below links for more information onHttpModule/HttpHandler examples:

http://support.microsoft.com/kb/887289

http://aspalliance.com/articleViewer.aspx?aId=442

http://forums.asp.net/thread/1353901.aspx

http://www.codeproject.com/useritems/http-module-ip-security.asp

http://briandela.com/blog/archive/2005/06/29/652.aspx
http://support.microsoft.com/kb/887289http://aspalliance.com/articleViewer.aspx?aId=442http://forums.asp.net/thread/1353901.aspxhttp://www.codeproject.com/useritems/http-module-ip-security.asphttp://briandela.com/blog/archive/2005/06/29/652.aspxhttp://briandela.com/blog/archive/2005/06/29/652.aspxhttp://www.codeproject.com/useritems/http-module-ip-security.asphttp://forums.asp.net/thread/1353901.aspxhttp://aspalliance.com/articleViewer.aspx?aId=442http://support.microsoft.com/kb/887289

ASPNET Pipeline SreedharKoganti

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