[Python] What is the proper way to make downstream HTTP requests inside of Uvicorn/FastAPI?

I have an API endpoint (FastAPI / Uvicorn). Among other things, it makes a request to yet another API for information. When I load my API with multiple concurrent requests, I begin to receive the following error:

h11._util.LocalProtocolError: can't handle event type ConnectionClosed when role=SERVER and state=SEND_RESPONSE


In a normal environment, I would take advantage of request.session, but I understand it not to be fully thread safe.

Thus, what is the proper approach to using requests within a framework such as FastAPI, where multiple threads would be using the requests library at the same time?

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