incoming X-Forwarded-For in conditional evaulation

[Francis Daly]

On Wed, Oct 27, 2010 at 02:38:35PM +0400, Andrey Semyonov wrote:

Hi there,

> I've tried to filter like this:
>         if ($http_X-Forwarded-For = "1.2.3.4") { proxy_set_header
> X-Forwarded-For "1.2.3.4"; }
> but that didn't work. How do I evaluate incoming custom HTTP headers
> (those not having their own dedicated variables like $content_length
> and others) in config file?

Without having tested whether this if/set works here:

http://wiki.nginx.org/HttpRewriteModule#if gives some examples like

  if ($http_user_agent ~ MSIE) {

and

  if ($http_cookie ~* "id=([^;] +)(?:;|$)" ) {

which suggest the pattern used; while

http://wiki.nginx.org/HttpCoreModule#Variables says

"""
$http_HEADER

The value of the HTTP header HEADER when converted to lowercase and
with 'dashes' converted to 'underscores', e.g. $http_user_agent,
$http_referer...;
"""

All the best,

	f
-- 
Francis Daly        francis at daoine.org