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* WSGI is a spec, Paste was the original (AFAIK) implementation. Interestingly, WSGI was itself inspired by the Servlet API.

Hack is certainly usable, although I would consider it deprecated in favor of WAI (mostly for performance reasons): http://www.yesodweb.com/book/wai

I included code samples from several of these in a presentation I did a little while ago: http://www.slideshare.net/bscofield/great-developers-steal/2...