I asked a related question a few years ago on the AOLserver mailing list, and received a plethora of responses!
http://comments.gmane.org/gmane.comp.web.aolserver/16000As well as ns_http queue, you have ns_httpspost and friends in the ns_openssl Tcl API (if you want to get really deep into it!). The one thing missing was a ns_https equivalent for the core's ns_http command.
cheers!
Brian
