Describe the bug

when query new fine tune events with openai:
openai.FineTuningJob.list_events(id="ft-abc123", limit=10,api_key="xxxx",api_base="xxxx")

the http request doesn't go to api_base domain, instead go to the offical api site.

To Reproduce

1. set up a nginx proxy for openai official api
2. query fine tune job event with openai.FineTuningJob.list_events(id="ft-abc123", limit=10,api_key="xxxx",api_base="xxxx")
3. http requests go to offical api site instead the nginx proxy.

Code snippets

openai.FineTuningJob.list_events(id="ft-abc123", limit=10,api_key="xxxx",api_base="xxxx")

OS

linux

Python version

python 3.10

Library version

openai-python v0.28.0