Python 3 requests and live output from Flask Response()

I am using Python 3.8 on a Linux 5.4 machine. I have a Python Flask server with an endpoint that returns the output of the 'docker-compose logs' command. In a browser, the connection stays open and the page is updated automatically when new log output is generated by docker-compose. I want to do the same thing with requests from the terminal. I've tried the streaming example in this post: Python Requests Stream Data from API. However, nothing is ever printed and the function call appears to hang.

How can I view the 'live output' from the docker-compose logs command using Python 3 Requests as a client for the Flask endpoint? Thanks.

Requests Stream:

>>> def stream():
    s = requests.Session()
    r = s.get(url, headers=headers, stream=True)
    print(r.status_code)
    for line in r.iter_lines():
        if line:
            print(line)

Endpoint

# Define the function that will yield from the docker logs command
def getLogs():

    try:

        cmd = 'cd /persistent-storage/docker-compose && docker-compose logs --tail=10 -t -f --no-color'
        app.config['LOGGER'].info(f"Running command: {cmd} ...")
        proc = subprocess.Popen(
            cmd,
            shell=True,
            universal_newlines=True,
            stdout=subprocess.PIPE
        )

        # Read the standard output and yield it to the logger
        for line in iter(proc.stdout.readline,''):
            time.sleep(0.005)
            yield line.rstrip() + '<br/>\n'

    except Exception as err:

        app.config['LOGGER'].error(f"Could not get docker-compose logs: {err} ...")

# Return a 'live feed' to the browser of the docker-compose logs
return Response(getLogs(), mimetype='text/html')

from Python 3 requests and live output from Flask Response()