I have written a small server with Ningle, which in turn is using Clack to start a web server such as Hunchentoot or Woo.
I have of course obtained the needed certificates.
That was in fact quite simple.
(clack:clackup <server> :ssl t :ssl-key-file <path to file> :ssl-cert-file <path to file>)
Note: I understand from this issue that Woo does not yet support SSL, however at least Hunchentoot does.