How do I write a web server in C/C++ on linux

I am looking into developing a small (read:rudimentary) web server on a linux platform and I have no idea where to start.

What I want it to be able to do is:

• Listen on a specific port
• Take HTTP post and get requests
• Respond appropriately
• No session management required
• Has to be in C or C++
• Has to run as a service on boot

I am familiar with HTTP headers and am an experienced PHP and .Net web developer, but I am not sure where to start with this task.

Can you advise me with some resources to bridge the learning curve?