Linux/windows—临时实现Http代理

export http_proxy="http://192.168.58.21:7890" 
export https_proxy="http://192.168.58.21:7890" 

export http_proxy="http://192.168.88.51:7897" 
export https_proxy="http://192.168.88.51:7897" 

export http_proxy="http://127.0.0.1:7890" 
export https_proxy="http://127.0.0.1:7890" 

export http_proxy="" 
export https_proxy="" 

set http_proxy=http://127.0.0.1:7897
set https_proxy=http://127.0.0.1:7897