If you are not using Debian, you will need to download and install +cl-modlisp readme

cl-modlisp Documentation

Overview

cl-modlisp provides the Lisp side of the interface to Marc Battyani's mod_lisp apache module (http://www.fractalconcept.com).

support for AllegroCL, CMUCL, SBCL with sb-thread, and Lispworks.
listener and worker socket/process management so that shutting down the listener closes all related open sockets and terminates all related proceses.
support for running multiple command processors on multiple ports.
transparent support for precomputing the HTML or XML response to take advantage of HTTP/1.1's Keep-Alive feature. This is switchable with a single keyword argument to the macro with-ml-page.
Optional timeout of worker processes
Two process models for flexibility
Demonstration processor included

The easiest way to install is to use the Debian GNU/Linux operating system. Using the testing or unstable distributions, you can give the command:
apt-get install libapache-mod-lisp cl-modlisp cl-kmrcl
If you are not using Debian, you will need to download and install mod_lisp, cl-modlisp, and cl-kmrcl manually.
Add something like the below to httpd.conf and then restart apache
LispServer 127.0.0.1 20123 "localhost"
AddHandler lisp-handler .lsp
Start your Lisp implementation and load cl-modlisp with
(asdf:operate 'asdf:load-op 'modlisp)
Start the server with
(ml:modlisp-start :port 20123)
Try some demostration pages
links http://localhost/fixed.lsp
links http://localhost/debug.lsp
Shutdown the all cl-modlisp servers with
(ml:modlisp-stop-all)

There are two process models

Each connection spawns a new thread
This is the default model. Each new connection to listener socket spawns a new connection. This allows for an arbitrary number of concurrent connections. This has advantages if the workers require a long execution time.
Fixed pool of workers
This model is selected by passing the number of worker processes to init/listener with the keyword number-fixed-workers. This model has a lower overhead since new processes are not created and destroyed with each connection. It has advantages when the workers have a short execution time.

The demo.lisp file for examples of using cl-modlisp.

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