Dynamic Proxy Support about gcsf

[harababurel]

This might be achievable using something like hyper-proxy, but there is a chance that it requires changes to the Drive API library itself instead of GCSF. I will look into it and see what I can do.

[erenoglu]

Alternatively it can check a PAC file each time it connects and applies the rules given there, or connect direct if it can't reach the PAC file server.

[caryyu]

This(https://github.com/rofl0r/proxychains-ng) can work:

~/.proxychains.conf

strict_chain
proxy_dns
remote_dns_subnet 224
tcp_read_time_out 15000
tcp_connect_time_out 8000

[ProxyList]
http 127.0.0.1 7890

> proxychains4 -q -f ~/.proxychains.conf gcsf login caryyu