X-Forwarded-Server represents the last server in a row of reverse proxies in the common use, see: - https://www.fastly.com/documentation/reference/http/http-headers/X-Forwarded-Server/ - https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#x-headers - https://docs.valsight.com/on-premise/latest/reverse-proxy X-Forwarded-Host instead is the original request host. This change adapts our NGINX module to the common use of this header.