HttpModule & HttpHandler

Concept

1. 　　HttpHandler: Using to process that runs in response to a specific request made to an ASP.NET Web applicat
2. 　　HttpModule:  It’s an assembly that is called on every request that is made to your application.

Scenarios

　　1.    HttpHandler : RSS feeds,

　　2.    HttpModule: Security, log , Custom footers and heads

Usage

1. HttpHander:  Implements IHttpHandler or IHttpAsyncHandler, and register it in Web.config or IIS.
2. HttpModule: Implements IHttpModule, and register it in Web.config or IIS.

Difference

1. HttpHandler is used to process a specific request. HttpModule can process every request.
2. Allow one more HttpModule in a web site, not allow one more HttpHander to process a specific request.