GoogleAppEngine web proxy

Does anyone know of a simple open source proxy capable of running on google app engine or where to start in making one? (preferably in python, 开发者_运维技巧I'm trying to bypass a site blocking system)

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You can try Mirrorrr:

http://code.google.com/p/mirrorrr/

Or Masher Nations, Itube Appengine, Tohr, etc.