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I'd like to create a web server that responds to every incoming request with a simple "Hello" message in C#.
How do I do that?
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One solid approach is to use Microsoft Message Queue (MSMQ) to submit messages into a queue, and have another application pick up the incoming request to process. The result is then returned in a response message that the Web application can poll for.
The server opens a socket that 'listens' at port 80 and 'accepts' new connections from that socket. Each new connection is represented by a new socket whose local port is also port 80, but whose remote IP:port is as per the client who connected. So they don't get mixed up.
HTTP Basics The client (usually a browser) opens a connection to the server and sends a request. The server processes the request, generates a response, and closes the connection if it finds a Connection: Close header.
How much of it do you need to do from scratch? It's pretty simple to do this if you're allowed to use HttpListener.
Otherwise, you might want to look at TcpListener - accept a socket connection, read data from it, and write a response. Admittedly it's somewhat easier if you can answer every request with "Hello" as you don't need to really parse it...
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You can read an article on CodeProject
http://www.codeproject.com/KB/IP/mywebserver.aspx
There is also a project on codeplex
http://webserver.codeplex.com/
You will need Sockets, Multithreading and the RFC http://www.faqs.org/rfcs/rfc2616.html
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