How do proxy_module response buffering options work?

[Maxim Dounin]

Hello!

On Mon, Apr 25, 2011 at 12:07:30AM +0200, Hongli Lai wrote:

> Maxim Dounin wrote in post #994788:
> > Busy buffers are buffers which are already passed downstream but
> > not yet completely send (and hence can't be reused).  The
> > proxy_busy_buffers_size directive limits maximum total size of
> > such buffers and thus allows remaining buffers to be used to read
> > upstream response (and spool it to disk if needed).
> 
> How can this be? Isn't there only a single buffer at any time that's 
> only partially passed downstream?

No, nginx passes downstream chain of buffers, not a single buffer.

> The proxy buffers are per request, not global, right?

Right.

Maxim Dounin