Nginx + Thin cluster of 3. Which Thin took the request?

[comopasta Gr]

Hi, I just managed to setup a front end web server with Nginx and then a
cluster of 3 Thin servers behind it who serve instances of the same app.

At least the app responds properly through Nginx.
After making a request, how can I find out which app actually processed
the request? The only log I see growing is the development.log
I have thin.300x.log files but don't increase in size when requests are
made...

Thanks
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