mrhttpd
A lightning fast, simple, robust and secure web server.
...It scales very well with high levels of concurrency and responds very well to the BFS CPU scheduler by Con Kolivas.
One of the differentiating features is that the server is configured at compile time only. It will not read a configuration file at runtime. That makes it suitable for embedded systems as well.
The latest version is always available as a Docker image on Docker Hub: dockahdockah/mrhttpd
Read the documentation included in the distribution for more information.