Aiohttp-wsgi

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- Fixing incorrect quoting of ``PATH_INFO`` and ``SCRIPT_NAME`` in environ.

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- Upgrading :mod:`aiohttp` dependency to >= 0.22.2.

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- Fixing missing multiple headers sent from start_response.
- **Breaking:** Removed outbuf_overflow setting. Responses are always buffered in memory.
- **Breaking:** WSGI streaming responses are buffered fully in memory before being sent.

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- Identical to 0.5.1, after PyPi release proved mysteriously broken.

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- ``outbuf_overflow`` no longer creates a temporary buffer file, instead pausing the worker thread until the pending response has been flushed.

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- Minimum :ref:`aiohttp <aiohttp-web>` version is now 0.21.2.
- Added :doc:`aiohttp-wsgi-serve <main>` command line interface.
- Responses over 1MB will be buffered in a temporary file. Can be configured using the ``outbuf_overflow`` argument to :class:`WSGIHandler`.
- **Breaking:** Removed support for Python 3.4.
- **Breaking:** Removed ``aiohttp.concurrent`` helpers, which are no longer required with Python 3.5+.
- **Breaking:** Removed ``configure_server()`` and ``close_server()`` helpers. Use :class:`WSGIHandler` directly.
- **Breaking:** Removed ``serve()`` helpers. Use the :doc:`command line interface <main>` directly.