As proposed in:

http://mail-index.netbsd.org/tech-userlevel/2016/05/18/msg009999.html

and

https://www.netbsd.org/~agc/bozo-20160517.diff

add a patch to httpd to return the version string of httpd itself, and use the
-G option on the command line to enable this. This gives httpd the ability to
show, from the command line, what version is running.

% /usr/build/obj/x86_64/usr/src/libexec/httpd/bozohttpd -G
bozohttpd version bozohttpd/20160415
%

(agc)