Subrequests from body filters

[Marat Dakota]

>> But is it ok to call next body filter in subrequest's body filter to
>> produce output to main request?
>> I mean ngx_http_next_body_filter(r->main, out).
>
> No.  You should call next body filter of the request you are
> working with.  It's postpone filter responsibility to manage
> subrequests output, and if you try to do this yourself instead -
> result will be undefined.

It seems to work as expected for me. How can I cause problems with this?

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Marat