FreeBSD安装pache HTTP Server 出现Failed to enable the ‘httpready’ Accept Filter

FreeBSD has special driver called accf_http. It will buffer incoming connections until a certain complete HTTP requests arrive to speed up and optimize performance.

The utility of accf_http is such that a server will not have to context switch several times before performing the initial parsing of the request. This effectively reduces the amount of required CPU utilization to handle incoming requests by keeping active processes in preforking servers such as Apache low and reducing the size of the file descriptor set that needs to be managed by interfaces such as select(), poll() or kevent() based servers.

Just open shell prompt and type the following command to load accf_http under FreeBSD :
# kldload accf_http
Restart apache:
# /usr/local/etc/rc.d/apache22 restart

Update /boot/loader.conf file

Type the following command so that driver get loaded at the time of booting system:
# echo 'accf_http_load="YES"' >> /boot/loader.conf

A note about FreeBSD jails (vps)

Under jail you cannot load this module. It needs to be loaded from host using above command.