Apache HTTP Server module that drops the connection (NGINX 444 style).
apt-get install apache2-dev binutilsinstall -d -m755 /usr/local/lib/apache2/modules apxs -c -S LIBEXECDIR=/usr/local/lib/apache2/modules mod_444.c apxs -i -S LIBEXECDIR=/usr/local/lib/apache2/modules mod_444.la strip --strip-unneeded /usr/local/lib/apache2/modules/mod_444.soLoadModule mod_444_module /usr/local/lib/apache2/modules/mod_444.sohttp_response_code(444); exit;