how to use keepalive with Nginx revers proxy?

[Makailol Charls]

Hi,

Can some one provide me an example to set keep alive connection between
Nginx(reverse proxy) and backend server?

I can not use upstream module as my backend IP is dynamic based on
variable. So I can not use keepalive directive of upstream.

I have used below directive in location block.
proxy_pass http://$IP ;

Thanks,
Makaikol
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