Hi.
Nginx, in one of the headers filters, can do ETag and Last-Modified
validation.
I want to be able to use this feature, so I don't have to use thirdy
party solutions.
However with the current WSGI implementation this is not possible.
A possibile solution can be to add an extension `x-wsgiorg.flush`, a
callable object that notify the WSGI gateway that it can flush the
headers (if they are not yet be sent) or the output buffer (Nginx has
this feature, however I have yet not understand how it works).
start_response('200 Ok', [('Last-Modified', 'xxx')])
...
environ['x-wsgiorg.flush']()
return a-generator
The WSGI gateway can now send the headers before iterating over the
generator, and if the client content is up-to-date, the new content is
never generated.
The intent of this extension is to be transparent to the WSGI application.
In case of nginx mod_wsgi, the validation can be done by Nginx, but for
generic WSGI applications this can be done by a middleware.
I don't know if this feature is feasible, since I have not yet
implemented it, so I would like to receive some feedbacks.
Thanks Manlio Perillo
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