How to limit_req depending if the requests has a REFERER or not.

[Joseph Cabezas]

I have something like this... I need to be able to apply three different 
limit_req depending:

a.) If the referer to click.php is domain.com ... apply zone1
b.) If there is some other referer apply zone2 on click.php
c.) If there is no referer apply zone3 on click.php


  location /click.php { limit_req zone=one;  proxy_pass http://backend; }


Thanks guys
 		 	   		  
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