命令行走代理，http_proxy和https_proxy设置问题

Question

windows中命令行要使用代理，http_proxy和https_proxy有如下写法：

1、有引号

set http_proxy="socks5://127.0.0.1:13569"   
set https_proxy="socks5://127.0.0.1:13569" 

2、无引号

set http_proxy=socks5://127.0.0.1:13569
set https_proxy=socks5://127.0.0.1:13569

问题：
1、加上引号使用会报错：

D:\vagrant_env
λ set http_proxy="socks5://127.0.0.1:13569"

D:\vagrant_env
λ set https_proxy="socks5://127.0.0.1:13569"

D:\vagrant_env
λ vagrant plugin install vagrant-vbguest
Installing the 'vagrant-vbguest' plugin. This can take a few minutes...
C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/uri/rfc3986_parser.rb:67:in `split': bad URI(is not URI?): http://"socks5://127.0.0.1:13569" (URI::InvalidURIError)

2、不加引号好像同样翻不了：

D:\vagrant_env
λ set http_proxy=socks5://127.0.0.1:13569

D:\vagrant_env
λ set https_proxy=socks5://127.0.0.1:13569

D:\vagrant_env
λ vagrant plugin install vagrant-vbguest
Installing the 'vagrant-vbguest' plugin. This can take a few minutes...
Vagrant failed to load a configured plugin source. This can be caused
by a variety of issues including: transient connectivity issues, proxy
filtering rejecting access to a configured plugin source, or a configured
plugin source not responding correctly. Please review the error message
below to help resolve the issue:

  no such name (https://gems.hashicorp.com/specs.4.8.gz)

Source: https://gems.hashicorp.com/

所以，应该怎么写才对？

Answer 1

因为 socks5://127.0.0.1:13569 这是 socks5 代理, 不是 http 代理.