$upstream_addr containing the same ip twice

[Maxim Dounin]

Hello!

On Wed, Feb 18, 2015 at 09:03:47PM -0600, Kunal Pariani wrote:

> Hello, 
> I have just 1 backend server being reverse-proxied through nginx. The access log lists this one request for which the $upstream_addr has the same ip:port twice. Is this a bug ? 
> 
> ::ffff:10.255.255.248:51947 - - [18/Feb/2015:19:52:43 -0600] "GET / HTTP/1.1" 302 454 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:35.0) Gecko/20100101 Firefox/35.0" "a.b.c.d:e, a.b.c.d:e " 
> 
> This is how the the log_format is defined 
> log_format upstream '$remote_addr:$remote_port - $remote_user [$time_local] ' 
> '"$request" $status $bytes_sent ' 
> '"$http_referer" "$http_user_agent" "$upstream_addr"'; 

This can legitimately happen, e.g., if you configure an upstream 
with multiple servers with the same IP address.

-- 
Maxim Dounin
http://nginx.org/