ASGI app that iteratively echo backs request body

asgiecho.py

async def application(scope, receive, send):
    if scope['type'] != 'http':
        return
    initial = True
    more_body = True
    while more_body:
        chunk = await receive()
        if chunk['type'] != 'http.request':
            break
        body = chunk['body']
        if initial:
            await send({'type': 'http.response.start', 'status': 200})
            initial = False
        more_body = chunk['more_body']
        await send({'type': 'http.response.body', 'body': body, 'more_body': more_body})