<8> httpx基础

支持HTTP/2.0，异步

1.安装
pip install httpx[http2]

2.基本使用（类似requests）
httpx 默认使用的 HTTP/1.1，需要手动声明才能使用HTTP/2.0

import httpx

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

3.Client 对象
类似requests的session，在声明 Client 对象时可以指定参数

import httpx

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

等价于====>>

import httpx

client = httpx.Client(http2=True)
try:
  response = client.get('https://spa16.scrape.center/')
finally:
  client.close()
print(response.text)

4.支持异步请求(了解)
官方文档: https://ww.python-httpx.org/async/

import httpx

import asyncio
async def start_url():
  url = 'https://www.httpbin.org/get'
  async with httpx.AsyncClient(http2=True) as client:
      response = await client.get(url=url)
      print(response.text)

if __name__ == '__main__':
  asyncio.get_event_loop().run_until_complete(start_url())