Hello!

On Thu, Feb 27, 2020 at 11:20:41AM +0100, Sergey Brester wrote:

> I could imagine that this doesn't work as expected because
> mail::auth_http simply makes fewer requests as you may assume (due to
> keep-alive + some internal "cache" for established connections).

There is no keep-alive nor any cache for established connections
in auth_http. The auth_http server is called for each
authentication attempt. As long as authentication is successful,
nginx establishes an opaque connection to the backend server as
indicated by the auth server response.

[...]

> @nginx-devel: I don't see a troubles to extend directives of
> "ngx_http_limit_req_module" to consider mail/server too.
> Are there some objections against that?

There are no requests in mail. Further, to delay authentication
for clients auth_http already has the Auth-Wait header.

Further, I don't see what you are trying to debug here. As I see
from the messages in this thread, the issue was lack of IPv6
listener while using an IPv6 address in auth_http, and it is
already resolved.

--
Maxim Dounin
http://mdounin.ru/
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