Re: ngx_http_request_t's subrequests is what meaning be？

[BoBo]

if r->main->subrequests is  avoid subrequests cycle, so why need
r->main->subrequests++
? because i think  r->main->subrequests-- and judge r->main->subrequests is
or not 0 can avoid subrequests cycle.

thanks.
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