this worked wonders! I'll keep testing it and submit a pull request by tomorrow.

the changes were a little more complex than just adding a call to ServeContent (they always are) but i think i managed to get everything right. see here: https://github.com/fiatjaf/khatru/compare/master...girino:khatru:master

(there is still some debug "prints" in there, i'll remove them before the pull request)