thttpd is a simple, small, portable, fast, and secure HTTP server.

Simple:

It handles only the minimum necessary to implement HTTP/1.1. Well, maybe a little more than the minimum.

Small:

See the comparison chart. It also has a very small run-time size, since it does not fork and is very careful about memory allocation.

Portable:

It compiles cleanly on most any Unix-like OS, specifically including FreeBSD, SunOS 4, Solaris 2, BSD/OS, Linux, OSF.

Fast:

In typical use it’s about as fast as the best full-featured servers (Apache, NCSA, Netscape). Under extreme load it’s much faster.

Secure:

It goes to great lengths to protect the web server machine against attacks and breakins from other sites.

 

http://www.acme.com/software/thttpd/

http://www.linuxhowtos.org/C_C++/socket.htm