good hint thanks, this time I should have read the documentation or well I should have read it more detailled.

This page http://wiki.codemongers.com/NginxHttpRewriteModule#rewrite says that if there is no location block (I don't have one) I have to use last instead of break.

Why should I use "last" in this example (from the link above)?:

rewrite ^(/download/.*)/media/(.*)\..*$ $1/mp3/$2.mp3 last; rewrite ^(/download/.*)/audio/(.*)\..*$ $1/mp3/$2.ra last; return 403;