可以避免各种CDN对获取真实用户IP的影响，HTTP_ALI_CDN_REAL_IP、HTTP_TRUE_CLIENT_IP、HTTP_X_REAL_FORWARDED_FOR、HTTP_X_CONNECTING_IP、HTTP_CF_CONNECTING_IP、HTTP_X_FORWARD_FOR、HTTP_X_REAL_IP、HTTP_X_FORWARDED_FOR
全栈程序猿
