Asgi

hello world example # 

async def app(scope, receive, send):
    await send({
        'type': 'http.response.start',
        'status': 200,
        'headers': [
            [b'content-type', b'text/plain'],
        ]
    })
    await send({
        'type': 'http.response.body',
        'body': b'Hello, world!',
    })

当前版本 ASGI 3.0 (2019-03-04)

ASGI application: coroutine application(scope, receive, send)

connection scope information, 一个 dict, at least includes type: http, websocket, lifespan await receive , 然后得到 event dict await send(event dict)