parse (and log) the header from fastcgi

multiple -v don't make it more verbose anymore

change on fatalx -> log_warnx we already check the validity of the format string, but still avoid a gratious fatal() at runtime.

rename fmt_sbuf -> fmtbuf; make the buffer explicit

add some ideas

avoid needless strlen()

simplify request handling get rid of check_path(), it's overly complicated. Instead, inline open_file() in client_read() and rework open_dir() to just use openat() instead of the complicate dance it was doing. Simplify open_dir() too in the process: if the directory entry for the index is not a regular file, pretend it doesn't exist.

use a function-local buffer for the canonical redirect

remove the fcgi debug code

make `listen on' defaults on port 1965

use snprintf() instead of chain of strlcpy/cat

call getnameinfo() only once per request

avoid gratious strlen; evbuffer_readln returns the length

rework check

default chroot to user' home if unset