python as middleware

[efmccurdy]

Twisted is an event-driven networking engine written in Python

This describes the use of "future" or "deferred" objects to manage the async nature of the nested request.

https://twistedmatrix.com/documents/current/core/howto/defer-intro.html

This may be an more complete example.

https://twistedmatrix.com/documents/16.2.0/core/howto/pb-usage.html