[Web-SIG] WSGI and start_response

[Aaron Watters]

someone remind me: where is the canonical WSGI 2 spec?
I assume there is a way to "wrap" WSGI 1 applications
without breaking them?  Or is this the regex-->re fiasco
all over again?

   -- Aaron Watters

--- On Thu, 4/8/10, Manlio Perillo <manlio_perillo at libero.it> wrote:

> From: Manlio Perillo <manlio_perillo at libero.it>
> Subject: [Web-SIG] WSGI and start_response
> To: "'Web SIG'" <web-sig at python.org>
> Date: Thursday, April 8, 2010, 10:08 AM
> Hi.
> 
> Some time ago I objected the decision to remove
> start_response function
> from next version WSGI, using as rationale the fact that
> without
> start_callable, asynchronous extension are impossible to
> support.
> 
> Now I have found that removing start_response will also
> make impossible
> to support coroutines (or, at least, some coroutines
> usage).
> 
> Here is an example (this is the same example I posted few
> days ago):
> http://paste.pocoo.org/show/199202/
> 
> Forgetting about the write callable, the problem is that
> the application
> starts to yield data when tmpl.render_unicode function is
> called.
> 
> Please note that this has *nothing* to do with asynchronus
> applications.
> The code should work with *all* WSGI implementations.
> 
> 
> In the pasted example, the Mako render_unicode function is
> "turned" into
> a generator, with a simple function that allows to flush
> the current buffer.
> 
> 
> Can someone else confirm that this code is impossible to
> support in WSGI
> 2.0?
> 
> If my suspect is true, I once again object against removing
> start_response.
> 
> WSGI 1.0 is really a well designed protocol, since it is
> able to support
> both asynchonous application (with a custom extension) and
> coroutines,
> *even* if this was not considered during protocol design.
> 
> 
> Thanks  Manlio
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