nginx proxying do not locally save/buffer uploaded files?

[Pasi Kärkkäinen]

Hello,

I'm running nginx as a proxy in front of some backend servers,
and while uploading files (HTTP PUT) nginx seems to buffer the files
to local disk.

This is not a possible method for this setup, 
because some of the files are so big that they 
won't fit to the local disk of the nginx box.

Is there an option to disable this behaviour?
I'd like to directly stream the uploads to the backend..

Thanks,

-- Pasi