return local IP's country_code as 'LOCAL'

By default, local address like 192.168.1.1 will using URLFetch method, and will return failed message as HTTP 502. With this code modification, you can set proxy.ini 'regions = local' to force local address using DIRECT connect. BTW, you can set 'regions = local|cn' if you already set as 'cn'.
Merge pull request #30 from gwjwin/patch-1

return local IP's country_code as 'LOCAL'