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What are the HTTP Handlers and HTTP Modules

Posted By :Ashutosh Jha     Posted Date :August 31, 2014    Points :40   Category :.NET Framework 
HttpModule and HttpHandler are two components which comes with the HttpPipeLine while moving the request to HttpPipeLine. here HttpModule is used to check the request authentication and then routing so that it should be received by the correct handler(HttpHandler) for the process and then after processing , it validates the request and then route it back to the client.

You can also find related Interview Question to What are the HTTP Handlers and HTTP Modules  below: 

Where and how can you register the HTTP Handlers and HTTP Handler Factories

  
The information about HTTP Handlers and HTTP Handler Factories are registered in both machine.config & web.config. It is registered with the tag as follows.



(More...)

How to send XML file on server using HTTP protocol?

  
Using SOAP we can send XML file on Serevr (More...)

What is a HTTP Module?

  
HTTP modules are .NET components that implement the System.Web.IHttpModule interface. These components plug themselves into the ASP.NET request processing pipeline by registering themselves for certain events. Whenever those events occur, ASP.NET invokes the interested HTTP modules so that the modules can play with the request (More...)

Whether Http maintain states by default?

  
No. Http is a stateless protocol. Inorder to maintain the state we need either of the following in the pages.

View state
Session
Cookies
Cache
Query string or Request.Form (More...)

What are all the differences between http and https?

  
The "S" in HTTPS indicates a secure site. The server browser communication is unsecured in ordinary http where as in https, it needs to be secured in order to prevent unauthorized access.

HTTP is Hyper Text Transport Protocol and is transmitted over the wire via PORT 80(TCP) by default and it is not secured.

HTTPS (Hypertext Transfer Protocol over Secure Socket Layer, or HTTP over SSL) is a Web protocol developed by Netscape and built into its browser that encrypts and decrypts user page requests as well as the pages that are returned by the Web server. (More...)

Can you add a Cutsom Http Handler in SharePoint ?

  
Ans. Yes, a Custom httphandler can be deployed in _layouts folder in SharePoint. Also, we need to be register the handler in the webapp's webconfig file. (More...)

Can you add a Cutsom Http Handler in SharePoint ?

  
Yes, a Custom httphandler can be deployed in _layouts folder in SharePoint. Also, we need to be register the handler in the webapp's webconfig file. (More...)

List the event handlers that can be included in Global.asax?

  
o Application start and end event handlers
o Session start and end event handlers
o Per-request event handlers
o Non-deterministic event handlers (More...)

What event handlers can I include in Global.asax?

  
Application_Start,Application_End, Application_AcquireRequestState, Application_AuthenticateRequest, Application_AuthorizeRequest, Application_BeginRequest, Application_Disposed, Application_EndRequest, Application_Error, Application_PostRequestHandlerExecute, Application_PreRequestHandlerExecute,
Application_PreSendRequestContent, Application_PreSendRequestHeaders, Application_ReleaseRequestState, Application_ResolveRequestCache, Application_UpdateRequestCache, Session_Start,Session_End
You can optionally include "On" in any of method names. For example, you can name a BeginRequest event handler.Application_BeginRequest or Application_OnBeginRequest.You can also include event handlers in Global.asax for events fired by custom HTTP modules.Note that not all of the event handlers make sense for Web Services (they're designed for ASP.NET applications in general, whereas .NET XML Web Services are specialized instances of an ASP.NET app). For example, the Application_AuthenticateRequest and Application_AuthorizeRequest events are designed to be used with ASP.NET Forms authentication.
(More...)

How many event handlers in sharepoint?

  
1.SPItemEventReceiver
2.SPListEventReceiver
3.SPWebEventReceiver
(More...)

You have got an application containing 10 modules with each module of 10 MB. But your customer needs only 2 modules at reduced cost. How we should ship the application.

  
We can use plugin architectured application to reduce the shippable size to 20MB with only the 2 modules which customer had chosen.

In this way the cost and size of deployment is reduced + threat of cracking the other modules if shipped together. (More...)

What are the base classes, event handlers can inherit.

  
While developing event handlers there are several base classes from which you can inherit.

SPItemEventReciever: One must inherit from this base class if you want the event handler to be executed when the item is added,updated and deleted.

SPListEventReciever: One must inherit from this base class when you want the event handler to execute when the structure of the list is modifed or the content type added or removed from the list.

SPFeatureEventReciever: Inherit this base class if you want your event handler to execute when the feature events such as installation,unstallation,activation and deactivation are executed.

SPWebEventReciever: You can Inherit this base class if you want your event handlers to execute when site is added or removed from the site collection.

SPEmailEventReciever:Inherit this base class for creating a event handler for emails that are send to a Sharepoint list.
(More...)

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