proxy_pass without buffering and request filter question

[Sorin Manole]

Hello fellow nginxers,

>From searching the Internet I gathered that proxying requests to a backend
without buffering the whole body wasn't available at the time the question
was asked. Is still the case?
If yes, is this a limitation of the nginx core (lack of implementation of a
phase for request body processing) or of the proxy_pass module or of the
upstream module?
Could you give some more details of the limitation and whether the reason
for it still not being implemented is the lack of user requests or the
technical difficulty?
More specifically, how feasible do you think it would be for someone (like
me) to do this? Does it involve significant changes to the current design?

Thank you,
Sorin.
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