https://stackoverflow.com/questions/21284935/nginx-reverse-proxy-with-windows-authentication-that-uses-ntlm
https://web.archive.org/web/20200724074947/https://www.innovation.ch/personal/ronald/ntlm.html
https://github.com/envoyproxy/envoy/issues/21543
https://www.zevenet.com/knowledge-base/howtos/load-balancing-of-webapps-with-iis-authentication-ntlm-and-asp-net-impersonation/