location / {
proxy_pass https://proxy.example.com;
proxy_set_header X-Forwarded-For $http_x_forwarded_for;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host example.com;
}

location / {
satisfy any;
allow 91.225.236.99;
deny all;
auth_basic "Dev Zone";
auth_basic_user_file /home/user/htpasswd;
}