x-forward-header / x-real-ip

Igor Sysoev is at rambler-co.ru
Wed Apr 22 00:24:43 MSD 2009

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:
",,". 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

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