1. 查看已安装的包

pip freeze
# python -V
# Python 2.7.5

2. 安装anyio

刚开始直接pip install httpx，未设置版本号，因已有idna==2.7，所以出现版本不兼容的现象

anyio 3.0.0 requires idna>=2.8, but you have idna 2.7 which is incompatible.

尝试过后，选择anyio==1.3.0

pip install anyio==1.3.0

3. 安装httpcore

   httpcore 0.13.7 requires anyio==3.*, but you have anyio 1.3.0 which is incompatible.

   httpx 0.18.0 requires httpcore<0.14.0,>=0.13.0, but you have httpcore 0.10.0 which is incompatible.

设置httpcore==0.13.0

pip install httpcore==0.13.0

4. 安装httpx

pip install httpx==0.18.0

5. 安装httpx[http]

在本地未安装这个包，程序就能运行，在jumpserver中不安装时出现以下错误

Using http2=True, but the 'h2' package is not installed. Make sure to install httpx using `pip install httpx[http2]`.

pip install httpx[http2]