X-Forwarded-Host is a de facto standard for identifying the original host requested by the client in the Host HTTP request header, since the host name and/or port of the reverse proxy (load balancer) may differ from the origin server handling the request.[0]
Currently I have an API gateway in front so the end application/endpoint can receives the original host via X-Forwarded-Host header.

[0] https://en.wikipedia.org/wiki/List_of_HTTP_header_fields