Are you interested in a web server for Common Lisp? We have had these for years, for example Hunchentoot. This is a standalone web server, doesn't need to be connected to any other server. No need for Apache.
Take a look at the "lack" and "Clack" packages for Common Lisp by Eitaro Fukamachi; they provide a layer of abstraction so your program thinks it has a web server, but in production it can be run by various Lisp web servers (i.e. Hunchentoot) without changes to your code.
I’m interested in running Lisp web applications inside of Apache web server, for example with mod_lisp or through cgi-bin, although I’d prefer the former, simply because Apache has modules for many other functions as well. Unfortunately, what documentation there is on mod_lisp isn’t step by step to get from point A to point B.
Take a look at Clack. (Caveman2 is a web framework for Common Lisp, by Eitaro ("8arrow") Fukamachi; another recent web framework is Lucerne, by Fernando Borretti ("eudoxia0"))
Caveman is built on top of Clack and I think Lucerne is, too.
Another good option is Ningle, by Eitaro, which is a really mínimal minimal set of functions and macros to create a web application. Runs on top of Clack as well.
Take a look at the "lack" and "Clack" packages for Common Lisp by Eitaro Fukamachi; they provide a layer of abstraction so your program thinks it has a web server, but in production it can be run by various Lisp web servers (i.e. Hunchentoot) without changes to your code.