|Accept Filtering on FreeBSD:
|SO_ACCEPTFILTER is not
available on Linux. There is a socket option called TCP_DEFER_ACCEPT, which
is roughly equivalent to the “dataready” accept filter on FreeBSD. It’s not
quite as good as “httpready”, since with TCP_DEFER_ACCEPT, accept() will
return as soon as the socket becomes readable (i.e. after at least one byte
of the request is received).