thank you very much for your advice!
I will clean up my config...
The real work to do for me is to adapt and compile Nginx 0.8.35 or newer
for the OpenWRT distro I'm using.
This is because the latest nginx version available pre-built (as a
package) for the "atheros" platform of my router is 0.7.64, and I could
not find a distro that has a newer version.
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,180840,182022#msg-182022