Ensure generators are closed

import asyncio
from quart import Quart, Response

app = Quart(__name__)

@app.route('/')
async def sub():
        response = Response(
            data_stream(),
            mimetype="text/event-stream",
        )
        response.timeout = None
        return response

async def data_stream():
    try:
        while True:
            print("Sending Data")
            if False:
                yield "data: {ok: true}\n\n"
            await asyncio.sleep(1)
    finally:
        print("Exited Gen")
    
app.run()

Start with the provided Quart streaming-response reproduction and trace how the async generator is handled when the response ends or the client disconnects. Identify the response and generator-cleanup entry points, then verify the generator's finally block runs reliably; the issue provides no file or test names.