[clarkevans]

It seems like the author here is comparing Pump to WSGI -- perhaps a better comparison is to Ian Bicking's WebOb (http://webob.org) or Armin Ronacher's Werkzeug (http://werkzeug.pocoo.org/).

WSGI is a low-level protocol that provides a minimal interface to an HTTP Server ala CGI. It is purposefully not an application-level HTTP toolkit. For example, a WSGI component takes an input stream and returns an iterable which could yield output chunks... of perhaps in infinite data stream. These edge cases are sometimes very important and why the interface is designed as it is: inconvenient as it may be for simple apps.