Subrequest without returning to nginx

Dipl. Ing. Sergey Brester serg.brester at
Tue May 4 15:03:05 UTC 2021


What do you mean as "return to nginx"? Or with other words why it should
not? Or how you need to guarantee that a subrequest would take place at
all and will be considered on another side? 

As for njs and "it also returns to nginx", either I don't really
understand your approach or you simply missed the word "detached" in my
answer (and njs subrequest documentation). 

04.05.2021 16:49, Alfred Sawaya wrote: 

> mirror and post_action both return to nginx to complete the subrequest. 
> njs also does an event-driven subrequest (ie gives back a promise and set a callback), so it also returns to nginx to complete the subrequest. 
> On 04/05/2021 16:32, Dipl. Ing. Sergey Brester wrote: 
> Hi, 
> see how the directive mirror [2] or post_action doing this. 
> Also take a look at njs [3], how it can make a detached subrequest. 
> Regards,
> Serg. 
> 04.05.2021 16:11, Alfred Sawaya wrote: 
> Hello,
> I am currently converting an Apache module to Nginx. This module uses
> subrequests and needs (for now) to execute the subrequest without
> unwinding the stack (ie without returning to nginx).
> I tried to call ngx_http_run_posted_requests by hand, but it does not
> work as the upstream socket needs to get polled some time.
> So I wonder, is there any way to do this ?
> Of course I know that I shouldn't do it like this, but the current
> module is not reentrant and poorly architectured. I will eventually
> refactor it but later.
> Thanks,
> _______________________________________________
> nginx-devel mailing list
> nginx-devel at
> [1]

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