http://www.ruanyifeng.com/blog/2016/04/cors.html
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Requests_with_credentials
https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Access_control_CORS
http://www.ruanyifeng.com/blog/2016/04/cors.html
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Requests_with_credentials
https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Access_control_CORS