What are the events happening in IIS when a page is posted back to the server.

What are the events happening in IIS when a page is posted
back to the server.

Question Posted / tamilpriya05

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What are the events happening in IIS when a page is posted back to the server...

Answer / ashishjaviya @ nomura

whenever a request comes from Client to Server, it will hit
HTTP.SYS First
HTTP.SYS is Responsible for pass the request to particular
Application pool. Now here is one question, How HTTP.SYS
comes to know where to send the request? This is not a
random pickup. Whenever we creates a new Application Pool,
the ID of the Application Pool is being generated and it’s
registered with the HTTP.SYS. So whenever HTTP.SYS Received
the request from any web application, it checks for the
Application Pool and based on the application pool it send
the request.
So, this was the first steps of IIS Request Processing.
Till now, Client Requested for some information and request
came to the Kernel level of IIS means at HTTP.SYS. HTTP.SYS
has been identified the name of the application pool where
to send. Now, let’s see how this request moves from
HTTP.SYS to Application Pool.

In User Level of IIS, we have Web Admin Services (WAS)
which takes the request from HTTP.SYS and pass it to the
respective application pool.

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