> what i'm trying to do is limit the bandwith for each user that i have in
> a mysqlDB for some mp3.

You might be able to look at the postaction handler. We have something
like this:

location /xyz {
...
proxy_hide_header X-Rate-User;
post_action @ratepostaction;
}

location @ratepostaction {
set $rateuser $upstream_http_x_rate_user;
proxy_set_header RateUser $rateuser;
proxy_set_header RateURI "$host$request_uri";
proxy_set_header RateBytes $body_bytes_sent;
proxy_set_header RateIP $remote_addr;
proxy_set_header RateStatus $upstream_status;
proxy_pass_request_body off;
proxy_pass_request_headers off;
proxy_pass http://unix:/var/state/ratetrack/ratepostaction:;
}

To track used bandwidth for each user. The backend sets the X-Rate-User
header in the response, and there's a separate daemon running that
listens on /var/state/ratetrack/ratepostaction to receive the rate data
events.

I'm not sure how this interacts with NginxXSendfile though...

Rob

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