Can I extract the last IP address in X-Forwarded-For and assign it to a variable

[Subramanyam Chitti]

Thanks a lot. This works perfectly. Is $1 always guaranteed to be the
last IP in the X-Forwarded-For list?
Is it the string that is matched in the $ position in the regular expression?

On Fri, Jan 22, 2010 at 7:48 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> Hello!
>
> On Fri, Jan 22, 2010 at 08:46:02PM -0500, chittis wrote:
>
>> I want to get the last IP address in the X-Forwarded-For header
>> and assign it to a variable. I'm doing this using embeded perl
>> now. Is there a way I can do this using the map module and
>> regular expressions?
>
> Map? Probably you mean rewrite? Try something like this:
>
>   set $x "";
>   if ($http_x_forwarded_for ~ "(\d+\.\d+\.\d+\.\d+)$") {
>       set $x $1;
>   }
>
> Maxim Dounin
>
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-- 
Subramanyam Chitti