[issue7250] wsgiref.handlers.CGIHandler caches os.environ, leaking info between requests

[Brandon Bloom]

Brandon Bloom <snprbob86 at gmail.com> added the comment:

> That is, in a true CGI environment, there can't be *multiple* requests
> made to CGIHandler, and so it can't leak.  In "normal" (i.e. pre-GAE)
> long-running web environments, os.environ would not contain any request
> information, only the process startup environment.

That's fair. In this case the CGIHandler should raise an exception on
subsequent requests to prevent this programming error.

> If someone wants to provide a GAEHandler class, great; otherwise, the
> documented way to run a WSGI app under GAE is the
> google.appengine.ext.webapp.util.run_wsgi_app function.

I'm not sure if run_wsgi_app was available right from the start, as
some early tutorials and samples show using CGIHandler. That's how we
ran into this issue.

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