1. 安装包

pip install httpx[http2]

2. demo
   requests 包无法访问http2的server，httpx 支持，只需要设施http2=True 即可

import httpx
import requests
res= requests.get('https://spa16.scrape.center/',verify=False)
print(res.status_code)

with httpx.Client(http2=True) as clients:
    response = clients.get('https://spa16.scrape.center/')
    print(response.text)

异步

import httpx
import asyncio

async def test(url):
    async with httpx.AsyncClient(http2=True) as client:
        response = await client.get(url)
        print(response.status_code)
if __name__=='__main__':
    asyncio.get_event_loop().run_until_complete(test('https://www.httpbin.org/get'))