Hi,

I'm sure you can do that using on-board "equipment" of nginx, without
deep integrating to the nginx (without write of own module).

You can use for this a "post_action", something like:

post_action @after_request_location;

But (There is always a "but":), according to my last known stand:

- the feature "post_action" is asynchronously;
- the feature is not documentated (and possibly not recommended to
use);- if location "executed" in post_action uses upstreams (fcgi,
proxy_pass, etc.), it will always breaks a keepalive connection to the
upstream channel (possibly fixed, but I've missed).

Regards,
sebres.

Am 10.11.2015 19:51, schrieb Julien FROMENT:

> Hello,
>
> We would like to use Nginx to keep track of exactly what part of an upstream's server response was sent over a socket. Nginx could call an API asynchronously with the number of bytes sent over the socket for a given request.
>
> Here is the pseudo code:
>
> -- Client send a request
>
> -- Nginx processes the request and send it to the upstream
>
> ...
>
> -- The upstream returns the response
>
> -- Nginx sends the response to the client
>
> -- Nginx calls Async API with the number of bytes sent
>
> I read a little bit of "Emiller's Guide To Nginx Module Development", and I think we could write a Handler that provide some tracking information. But I am unsure if it is possible to hook it at a low enough level for our needs.
>
> Are there any expert on this mailing list that could provide us consulting services and guide us through the development of such functionality?
>
> Thanks in advance!
>
> Julien
>
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