0202httpx

request、urllib不支持http2.0协议，这时得用httpx.

安装httpx

pip3 install httpx #这种安装不支持http2

pip install "httpx[http2]" #支持http2

使用：

httpx的api设计接近requests

import httpx
r=httpx.get('https://www.httpbin.org/get') #data、headers、cookies、proxies
print(r.status_code)
print(r.headers)
print(r.txt)
print(r.http_version)#打印http version

请求http2(默认 httpx 未打开http2协议)

import httpx

with httpx.Client(http2=True) as client:   #client需要关闭掉
	r=client.get('https://spa16.scrape.center')
	print(r.text)

httpx.Client中传递 headers参数 p77

import httpx

headers={'User-Agent':'my-app/0.0`'}
with httpx.Client(headers=headers) as client:   #client需要关闭掉
	r=client.get('https://www.httpbin.org/headers')
	json=r.json()#将返回文本转换成json对象
	print(json['headers']['User-Agent'])

异步请求httpx.AnycClient p78

import httpx
import asyncio

async def fetch(url):
	async with httpx.AsyncClient(http2=True) as client:
		r=await client.get(url)
		print(r.text)

if __name__=="__main__":
	asyncio.get_event_loop().run_until_complete( fetch('https://www.httpbin.org/get') )