Why should one write their own HTTP module in asp net?

Answer 1

HTTP Modules like HTTP handlers are used to extend the HTTP pipeline. These are basically classes implementing the IHTTPModule Interface. These modules are used to process the incoming requests. Hence they can perform certain operations based on the requests and further allow them to pass through the pipeline.

For example we can write HTTP Modules to implement security. One can register the incoming requests for certain events with the help of such modules. These are listeda s below: -

Event
When It's Called

BeginRequest
Before request processing starts

AuthenticateRequest
To authenticate client

AuthorizeRequest
To perform access check

ResolveRequestCache
To get response from cache

AcquireRequestState
To load session state

PreRequestHandlerExecute
Before request sent to handler

PostRequestHandlerExecute
After request sent to handler

ReleaseRequestState
To store session state

UpdateRequestCache
To update response cache

EndRequest
After processing ends

PreSendRequestHeaders
Before buffered response headers sent

PreSendRequestContent
Before buffered response body sent

Application_OnStart
This event is raised when the very first request arrives to the Web application.

Application_OnEnd
This event is raised just before the application is going to terminate.

Session_OnStart
This event is raised for the very first request of the user's session.

Session_OnEnd
This event is raised when the session is abandoned or expired.