TODO

Keep-Alive
log, referer, user agent
refactor statbuf
zero length files, how to deal with them? browsers think connection was reset.
Time-Out
max conn/ip----no
HTTP Ranges
If-Modified-Since
directory listing
man tcp TCP_CORK
chroot
HTTP/1.0 RESPONSES TO HTTP/1.0 AND CHECK WHAT FEATURES AVAILABLE
fix client addr info and port
review errorcheck on low level io
efficiency of reply from mem

tuning
?max file sizes
https://stackoverflow.com/questions/880557/socket-accept-too-many-open-files

all about signals
http://www.linuxprogrammingblog.com/all-about-linux-signals?page=10

https://stackoverflow.com/questions/17355593/why-is-epoll-faster-than-select/23198432#23198432
https://idndx.com/2014/09/01/the-implementation-of-epoll-1/