Harish RanganathanApplication Platform EvangelistMicrosoft India

AGENDA

• HTTP Runtime • HTTP Context

• IIS & ASP.NET Relation • Global.asax

• HTTP Modules • Page Framework

• HTTP Handlers • Best Practices

HTTP Runtime

• A low-level HTTP processing infrastructure

• Logical replacement for ISAPI filters/extensions

• Ability to add, replace, or remove core pieces of

the product

• Benefits: Built-in thread pool, asynchronous

support, access to ASP.NET intrinsic objects

HTTP Runtime

Http Runtime

IIS-ASP.NET Relation

w3wp.exe (IIS 6.0)

http.sys (Kernel Mode)

IIS-ASP.NET Relation

Document types are

mapped to ISAPI

extensions in the IIS

Manager

IIS –ASP.NET Relation

HTTP Pipeline

HTTP Request

IIS aspnet_isapi HttpModules HttpHandler

HTTP Modules

• Called before and after the handler executes

• Ability to intercept, participate or modify each

individual request into an application

Ex: Changing URL in request/response to hide

server names behind firewall.

• The HTTP Application provides several events

that modules can synchronize with

HTTP Modules• Global Application Events:

– Start

– End

• Per request events (in order):

• Per request events (non-deterministic):

– PreSendRequestHeaders

– PreSendRequestContent

– Error

– BeginRequest

– AuthenticateRequest

– AuthorizeRequest

– ResolveRequestCache

– AcquireRequestState

– PreRequestHandlerExecute

– PostRequestHandlerExecute

– ReleaseRequestState

– UpdateRequestCache

– EndRequest

HTTP Modules

Built-In HTTP Modules:

• Authentication Modules

• Authorization Modules

• OutputCache Module

• SessionState Module

• Configuring HTTP Modules

– Use httpModules section handler

• View the Machine.Config

HTTP Handlers• Handlers:

– Are the endpoint in the request process

– Only one handler is invoked per request

• Examples

– ASP.NET Page Handler:

• Implements the ASP.NET Page Framework

• Processes all requests for .aspx pages

– ASP.NET Service Handler:

• Implements Web Services

• Processes all requests for .asmx pages

• Configuring HTTP Handlers

HTTP Handlers & Modules

HTTP Context

• Encapsulates all information about an individual

HTTP request

• ASP.NET intrinsic objects are exposed as properties

of the HttpContext

• Modules and Handlers get a reference to an

HttpContext object representing the current

request

• Flows through the lifetime of a request

HTTP Context• ASP.NET supports all ASP classic members

Property Managed Class

– Request HttpRequest

– Response HttpResponse

– Server HttpServerUtility

– Session HttpSessionState

– Application HttpApplicationState

• ASP.NET adds several new and useful members

– Request.Files

– Response.Cache

– Error/User/Trace

Global.asax

• Extends on the familiar functionality of the

Global.asa

• Global.asax must be located in the root of a Web

application

• Enables easy handling of Application level events

without a custom HttpModule

Global.asaxUpdates:

• Are automatically detected

• Causes the Global.asax to be recompiled

• Restarts the HTTP Application

• ASP.NET completes all current requests before

shutting down old application

• Fires Application_End event

• Shuts down App Domain

HTTP Context & Global.asax

Page Framework

• Overview

• Page Object

• Page Lifecycle

• Page Events

• Control Tree

• Page Directives

Page Framework

Page Object:

• Inherits from Control, implements IHttpHandler

• All .aspx pages inherit from Page

• Exposes the ASP.NET intrinsics

• Wires up events (Page_Load, Page_Init…)

Page Framework

Page Lifecycle:

Constructor PostBack Data Processing

ProcessRequest (hidden from user)

Init

Render

PreRender

Dispose

PostBack Event Handling

Load

PostBack Change Notification

LoadViewState

SaveViewState

Page Framework

Best Practices

• Return Multiple Resultsets

• Paged Data Access

• Connection Pooling

• ASP.NET Cache API

• Per Request caching

• Background Processing

Best Practices

• Page Output Caching and Proxy Servers

• Session State & Viewstate

• Debug vs. Release

• Exception Handling

http://www.microsoft.com/india/msdn

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© 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS,

IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.