401 response (API key) with local docker hosted server

Describe the bug
Trying to use a local hosted server from the docker container and accessing with the python api. I get a 401 error API key is missing, please provide an API key in the header". This is the same as #407 except the solution there didn't fix it for me.

To Reproduce
Ubuntu 20.04
docker pull downloads.unstructured.io/unstructured-io/unstructured-api:latest
docker run -p 8000:8000 -d --rm --name unstructured-api downloads.unstructured.io/unstructured-io/unstructured-api:latest

then in python:

client = unstructured_client.UnstructuredClient(
    server='free-api',
    server_url=os.getenv("http://0.0.0.0:8000/general/v0/general"),
)
# insert quick start example request here
res = client.general.partition(request=req)  # this raises the error `SDKError: API error occurred: Status 401`

Start by reproducing the issue with the documented Docker pull and run commands, then inspect the Python UnstructuredClient configuration and compare it with issue #407. Done means the local container accepts the Python client's general.partition request without returning a 401 missing-API-key error.