Lighttpd

It currently says

Disabling keep-alive might help your server if you suffer from a large number of open file-descriptors.

server.max-keep-alive-requests = 128
server.max-keep-alive-idle = 30
server.max-read-idle = 60
server.max-write-idle = 360

with no explanation of how to disable keep-alive. Also add that for high volume sites, setting a idle time of a couple seconds will help.