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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
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
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 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
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
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
Related Content
Breakout Sessions (session codes and titles)
Interactive Theater Sessions (session codes and titles)
Hands-on Labs (session codes and titles)
Hands-on Labs (session codes and titles)
Track Resources
Resource 1
Resource 2
Resource 3
Resource 4
© 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.
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