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Convert C{string} to a WSGI "bytes-as-unicode" string.
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application object in a non-I/O thread.
@ivar application: The WSGI application object.
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based and to which the application's output will be sent.
@ivar environ: The WSGI environment L{dict}.
@ivar status: The HTTP response status L{str} supplied to the WSGI
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@ivar _reactor: An L{IReactorThreads} provider which will be passed on to
L{_WSGIResponse} to schedule calls in the I/O thread.
@ivar _threadpool: A L{ThreadPool} which will be passed on to
L{_WSGIResponse} to run the WSGI application object.
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Turn the request into the appropriate C{environ} C{dict} suitable to be
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rendering process. C{NOT_DONE_YET} will always be returned in order
and response completion will be dictated by the application object, as
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