tornado: Never use proxies when talking from Django to Tornado.
tornado: Never use proxies when talking from Django to Tornado.

The `no_proxy` parameter does not work to remove proxying[1]; in this
case, since all requests with this adapter are to the internal Tornado
process, explicitly pass in an empty set of proxies to disable
proxying.

[1] https://github.com/psf/requests/issues/4600

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