彻底解决503错误，不会导致死循环

INFO - - [Jan 28 09:31:12] 127.0.0.1:60379 "CONNECT github.com:443 HTTP/1.1" - -

INFO - - [Jan 28 09:31:13] APPID Over Quota,Auto Switch to [***-2]
INFO - - [Jan 28 09:31:14] APPID Over Quota,Auto Switch to [***-3]
INFO - - [Jan 28 09:31:15] APPID Over Quota,Auto Switch to [***-4]
INFO - - [Jan 28 09:31:16] APPID Over Quota,Auto Switch to [***-5]
INFO - - [Jan 28 09:31:17] 127.0.0.1:60379 "GET https://github.com/goagent/goage
nt/ HTTP/1.1" 503 -
ERROR - - [Jan 28 09:31:18] All APPID Over Quota,Please Wait Some Time
INFO - - [Jan 28 09:31:18] 127.0.0.1:60390 "GET http://userscripts.org/scripts/s
ource/140411.meta.js HTTP/1.1" 503 -
INFO - - [Jan 28 09:31:22] 127.0.0.1:60394 "CONNECT github.com:443 HTTP/1.1" - -
ERROR - - [Jan 28 09:47:16] All APPID Over Quota,Please Wait Some Time
INFO - - [Jan 28 09:47:16] 127.0.0.1:61023 "GET http://www.useragentstring.com/
HTTP/1.1" 503 -
ERROR - - [Jan 28 09:47:25] All APPID Over Quota,Please Wait Some Time
INFO - - [Jan 28 09:47:25] 127.0.0.1:61027 "GET http://www.useragentstring.com/
HTTP/1.1" 503 -