Python httpx流数据异步？

Question

在链接https://zetcode.com/python/httpx/中，它具有以下stream示例

import httpx

url = 'https://download.freebsd.org/ftp/releases/amd64/amd64/ISO-IMAGES/12.0/FreeBSD-12.0-RELEASE-amd64-mini-memstick.img'

with open('FreeBSD-12.0-RELEASE-amd64-mini-memstick.img', 'wb') as f:
    with httpx.stream('GET', url) as r:
        for chunk in r.iter_bytes():
            f.write(chunk)

这是一种异步流式传输数据的方式吗？例如：

async def stream(call_back):
   async with httpx.stream('GET', url) as r:
       for chunk in await? r.iter_bytes():
           await call_back(chunk)

Answer 1

这应该会起作用，

async def stream(cb):
    async with httpx.AsyncClient() as client:
        async with client.stream('GET', url) as resp:
            async for chunk in resp.aiter_bytes():
                await cb(chunk)

问题是每个块都很小，比如3K字节。