I installed apache web server via FreeBSD Ports, while starting it up in FreeBSD system, Apache loads succcessfully and web server functioning properly, but the following warning error occurs:

[warn] (2)No such file or directory:

Failed to enable the 'httpready' Accept Filter

The resolution to the Failed to enable the 'httpready' Accept Filter problem is to a accf_http module, whose job is to buffer incoming connections until a certain complete HTTP requests arrive.
It can be loaded into FreeBSD kernel by using kernel linker as

kldload accf_http

To permanently load enable HTTP Accept Filter FreeBSD kernel module (accf_http), need to add the statement into file /boot/loader.conf

accf_http_load="YES"