How do I create a Web Server

[randall2nd]

I need to create an application that will act like a Web Server. I need it to be able to capture all traffic, process the traffic, and return a response.

I just need something to hit up against on my local machine, but I need to be able to view and manipulate the data as it is processed by the server.

Where would I start with this type of thing?
What Controls/Components should I look into using?
Know of any code snippets or open source apps that do this?

Any help/direction apreciated.

Randall2nd