Proxy Server

Server that layers some type of info/interaction on top of a 3rd party's "base".

WikiProxy, WikiMail, Annotation Systems

typically really talking about Caching Proxy Server

Les Orchard:PersonalWebProxy

The Universal Inbox could be thought of this way as well.

Ian Bicking identifies some issues that come up in a WSGI context.

Python-based Proxy Server-s

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