graeme_p - 7:06 am on Jul 6, 2013 (gmt 0)
My apologies if I am telling you what you already know.
No recommendations, but there are quite a few thing that look as though they will work. The ones that are familiar to me are high performance http servers: Lighttpd (I like the config syntax), nginx (most popular choice, and probably highest performance) or even Cherokee (gui config, least active devs) should be able to do it.
I also think Pound should be able to do it too. There are a host of others that may do.