correct usage of proxy_set_header?

[eN_Joy]

Hello all!
I have configured a location that acts list a transparent proxying cache:

	

        location /get
        {
            set $hostx "";
            set $addrs "";
            if ( $uri ~ "^/get/http./+([^/]+)/(.+)$") {
                set $hostx $1;
                set $addrs $2;
            }
            resolver 8.8.8.8;
            proxy_set_header Referer " ";
            proxy_pass http://$hostx/$addrs;
            proxy_redirect off;
            access_log /var/log/nginx/get_access.log;
        }

Basically when i browser to:

http://mysite.com/get/http://foo.com/bar/some.html 

it'll get:
http://foo.com/bar/some.html

The code indeed works that way, except that the directive `proxy_set_header
referer " "` is ignored. No matter what value I supply there (in the code
above, empty), my get_access.log will always show the referer being the
original refering page? 

What was wrong in my config?
Thanks,

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,247536,247536#msg-247536