Answer / answerme

An ASP.NET HTTP handler is the process that runs when any
request is made to an ASP.NET Web application. The most
common handler is an ASP.NET page handler that
processes .aspx files. When users request an .aspx file,
the request is processed by the page through the page
handler. You can create your own HTTP handlers that render
custom output to the browser.

An HTTP module is an assembly that is called on every
request that is made to your application. HTTP modules are
called as part of the ASP.NET request pipeline and have
access to life-cycle events throughout the request. HTTP
modules let you examine incoming and outgoing requests and
take action based on the request.

For HTTP Handler implementation (Synchronous):
http://msdn.microsoft.com/en-us/library/ms228090.aspx

For Registering HTTP Handler:
http://msdn.microsoft.com/en-us/library/46c5ddfy.aspx

For Configuring HTT handler:
http://msdn.microsoft.com/en-us/library/bb515343.aspx

For HTTP module implementation :
http://msdn.microsoft.com/en-us/library/ms227673.aspx

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