For testing FUSE + nginx (sendfile) on FreeBSD.

Required libs:
fusefs-libs (libfuse)
libcurl

Initialize: nginx uses /home/www and fusetest mounts /home/www/mnt
# kldload fuse
# mkdir -p /home/www/mnt
# chown -R www:www /home/www
# cp /usr/local/etc/nginx/nginx.conf /usr/local/etc/nginx/nginx.conf.org
# cp nginx.conf /usr/local/etc/nginx/
# service nginx restart

Make:
# make clean depend all

Run:
# ./fusetest
or for debugging message
# ./fusetest -d

Access:
Suppose you are running fusetest and ningx on server.example.com, access
http://server.example.com/mnt/BigBuckBunny-Full-web.mp4
with a web browser.
Seek the video until it freezes (just don't let it play).
If the video freezes, that's the sign of the nginx/sendfile issue.