python 包之 httpx 请求操作教程

一、安装
httpx是Python新一代的网络请求库
httpx与 requests 库的基本使用方法几乎是一模一样的
基于Python3的功能齐全的http请求模块
既能发送同步请求，也能发送异步请求
支持HTTP/1.1和HTTP/2
支持直接向WSGI应用程序或者ASGI应用程序发送请求

pip install httpx

二、请求类型

import httpx
httpx.get('https://www.baidu.com')
httpx.post('https://www.baidu.com')
httpx.put('https://www.baidu.com')
httpx.delete('https://www.baidu.com')
httpx.head('https://www.baidu.com')
httpx.options('https://www.baidu.com')

三、带参数请求

import httpx

data = {
    'name': 'autofelix',
    'age': 25
}

response = httpx.get('https://www.baidu.com', params=data)
print(response.url)
print(response.text)

四、自定义 headers

import httpx

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'
}
response =httpx.get('https://www.baidu.com', headers=headers)
print(response.text)

五、请求的属性

import httpx

response = httpx.get('https://www.baidu.com')

# 响应状态码
response.status_code
# 响应头
response.headers
# 响应cookie
response.cookies
# 请求url
response.url
# 历史记录
response.history

六、使用client发送请求

import httpx

with httpx.Client() as client:
    response = client.get('https://www.baidu.com')
    print(response.text)

七、HTTP代理

import httpx

proxies= {
    'http': 'http://127.0.0.1:9999',
    'https': 'http://127.0.0.1:8888'
}

with httpx.Client(proxies=proxies) as client:
    response = client.get('https://www.baidu.com')
    print(response)

八、超时处理

import httpx

# 普通请求超时处理
httpx.get('https://www.baidu.com', timeout=10.0)

# 普通请求关闭超时处理
httpx.get('https://www.baidu.com', timeout=None)

# client实例超时处理
with httpx.Client() as client:
    client.get('https://www.baidu.com', timeout=None)
    
# client实例关闭超时处理
with httpx.Client() as client:
    client.get('https://www.baidu.com', timeout=10.0)

九、SSL验证

import httpx

# 自带ca证书
response = httpx.get('https://www.baidu.com', verify="path/cert/client.pem")

# 完全禁用SSL验证
response = httpx.get('https://www.baidu.com', verify=False)

十、异步操作
使用async/await语句来进行异步操作
使用异步client比使用多线程发送请求更加高效，更能体现明显的性能优势

import asyncio
import httpx

async def main():
    async with httpx.AsyncClient() as client: 
        response = await client.get('https://www.baidu.com')
        print(response)

if __name__ == '__main__':
    asyncio.run(main())

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