x-forward-header / x-real-ip

[Igor Sysoev]

On Tue, Apr 21, 2009 at 12:41:16PM -0700, Payam Chychi wrote:

> hey guys,
> 
> what is the main difference between these two? reading the
> documentation it looks like both set the ip address of the client on
> the request which allows you to pass the real client ip address to a
> backend server via nginx proxy...  or i could be totally wrong here!
> 
> I was looking on the site for an example as to how the config would
> look if I wanted to let the backend know of the real client ip address
> that is requesting the connection... need this for load balancing.:

X-Forwared-For is header where proxy servers usually add client addresses:
"192.168.1.1, 10.10.10.1, 10.10.1.1". The variable $proxy_add_x_forwarded_for
does this addition. X-Real-IP is non standard header, where nginx
sets client addresses. Usually you need just one of the them.


-- 
Igor Sysoev
http://sysoev.ru/en/