Forum OpenACS Development: Re: Invalid command name "ns_httpsget"
Unlike nsopenssl, the nsssl module does not include any extra Tcl code, but it does appear to implement client-side support (in C) in its ns_ssl Tcl command. And it looks as if OpenACS does use ns_ssl in its util::http::* commands, so Gustaf is of course correct that you should try that stuff first. (Did it work for you?)
Btw, if you need client-side cookie support, way back in 2003 tclwebtest had it. It was fairly easy to copy the relevant small amount of Tcl code and modify it to work in AOLserver and OpenACS. With that sort of cookie support, I was able to e.g. make AOLserver log into an OpenACS site. Maybe there are better solutions by now.