Hello!
On Tue, May 16, 2017 at 06:18:27PM +0000, Prabhash Rathore wrote:
> We are using nginx 1.7.3 as a reverse proxy for our Mail SMTP service. For
> authentication of each SMTP connection, we have configured nginx to connect
> with a http based service for authentication. Here is a snippet of our
> nginx config:
>
> mail {
> # auth_server
> auth_http auth_host:auth_port/authserver;
>
> # mail server
> server {
> protocol smtp;
> listen 25;
> proxy on;
> xclient on;
> timeout 15;
> starttls on;
> ... other configs...
> }
> }
>
> With above config, we notice that nginx closes the connection after every
> auth request/response to Mail Authentication Server (auth_http
> auth_host:auth_port/authserver;) based on tcpdump analysis. We would like
> to make this connection persistent so that we could reuse connection for
> multiple auth requests.
>
> I looked at nginx mail auth module documentation (
> http://nginx.org/en/docs/mail/ngx_mail_auth_http_module.html#auth_http_header
> ) but I don't see any directive to make mail auth connection persistent.
The auth_http module uses HTTP/1.0 and has no keepalive
connections support.
If there are practical reasons why you want it to use keepalive, a
simple http proxy within the same nginx server will likely help.
--
Maxim Dounin
http://nginx.org/
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