Does this work for you?
https://serverfault.com/questions/768693/nginx-how-to-completely-disable-request-body-buffering

On Thu, Jul 19, 2018 at 8:45 AM, cyberfarer <nginx-forum@forum.nginx.org>
wrote:

> We have Nginx as a reverse proxy server to a Pydio server backend running
> with Apache2. We are attempting to upload a 50G file. The Nginx server,
> 1.14.0, is attempting to write the file locally to /var/lib/nginx/body/
> rather than sending it directly to the backend. Our proxy server has a very
> small footprint of just 13G.
>
> Is there an option to send the file directly to the backend without writing
> locally?
>
> Thank you.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.
> php?2,280578,280578#msg-280578
>
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