chaining proxies

gistfile1.txt

dkam@Nervous-Energy ~/Development/Booko/app/models/shops (master) $ curl -I http://imgsrv.booko.com.au:8888/9780307474612 
HTTP/1.1 200 OK
Content-Type: image/jpeg
Connection: keep-alive
Status: 200
X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.11
X-Frame-Options: sameorigin
X-XSS-Protection: 1; mode=block
Cache-Control: public, max-age=60480
Last-Modified: Wed, 29 Aug 2012 06:39:41 GMT
ETag: "35ad9b5a38a398db483304f616c79e69180a9928"
Content-Disposition: inline
Content-Length: 35788
X-Content-Digest: 35ad9b5a38a398db483304f616c79e69180a9928
Date: Wed, 19 Sep 2012 04:46:30 GMT
Age: 6362
X-Rack-Cache: fresh
Server: nginx/1.0.10 + Phusion Passenger 3.0.11 (mod_rails/mod_rack)

dkam@Nervous-Energy ~/Development/Booko/app/models/shops (master) $ curl -I http://static.booko.com.au/9780307474612 
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Wed, 19 Sep 2012 06:32:17 GMT
Content-Type: image/jpeg
Content-Length: 35788
Connection: keep-alive
Status: 200
X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.11
X-Frame-Options: sameorigin
X-XSS-Protection: 1; mode=block
Cache-Control: public, max-age=60480
Last-Modified: Wed, 29 Aug 2012 06:39:41 GMT
ETag: "35ad9b5a38a398db483304f616c79e69180a9928"
Content-Disposition: inline
X-Content-Digest: 35ad9b5a38a398db483304f616c79e69180a9928
Age: 0
X-Rack-Cache: miss, store