The UMLisp web site recently switched from using Franz's AllegroServe to using Marc Battyani's speedy mod_lisp Apache module. This module provides an interface from Apache to a Lisp server process. One of the very nice features of mod_lisp is that it supports persistant connections using HTTP/1.1's Keep-Alive protocol.
The downside of mod_lisp is that it is a very low-level interface and requires the creation of a listener process running in Lisp. cl-modlisp is a high-level interface that I wrote and made freely available that makes using mod_lisp a pleasure. It has number of useful features for process control and web page generation.
