Not necessarily specific to node.js, but in general, instead of a standard webserver, use netcat, on multiple obscure ports, where each instance of netcat acts once and is discarded.
Thank you for the link, but my approach is neither "half-assed" nor "voodoo". I've used netcat, as described, for a small project, and it worked well. I'm about to do the same, for a big project, and I expect that it will again work well. Standard webservers are bloated. Speed, security and stability can be enhanced by distributing work across a system of one-shot processes. I take some inspiration from Jef Poskanzer's design decisions in thttpd.
http://en.wikipedia.org/wiki/Netcat