Nginx: how to view what files are in downloading state?

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http://stackoverflow.com – I still wait for the answer. I need to view if someone is downloading a specific file at this moment. The initial problem: I would like to know when someone interrupts downloading the file. The server configuration: server { listen 80; server_name mysite.com; location /ugp/ { alias /www/ugp/; } break; } A user can download files from http://mysite.com/ugp/, for example http://mysite.com/ugp/1.mp3. UPDATE. It's no so obviously how to do it analyzing access.log. Some browsers send 206 code when user stops downloading (Google Chrome) some not (HTC player, (HowTos)