Rack: WSGI on Ruby

http://rack.rubyforge.org/


Interestingly, they take the approach we're talking about
for WSGI 2.0, as 
far as a call signature taking one argument and returning
three.

The spec is brief and to the point, in part because of that
simplicity, but 
also because they're ignoring HTTP 1.1 and issues like our
read() problems 
with the input stream.  They're also ignoring flow control,
push, 
asynchronous servers, etc.

Actually, the whole thing seems pretty underspecified, but
then they have 
some advantages we didn't.  At the time WSGI was created,
depending on an 
external library like wsgiref that wasn't in the stdlib was
an almost 
unheard-of luxury.  Anyway, the fact that they can define
the thing in 
terms of a canonical implementation, *and* don't have to
worry as much 
about backward compatibility with a wide variety of web
frameworks, means 
that they can probably actually get away with it.

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