Load Balancer config to route headers to API Portal

[Mohammad Shaik]

Hi All !
Greetings.. 

From the following CA documentation. I have a couple of queries.
https://techdocs.broadcom.com/content/broadcom/techdocs/us/en/ca-enterprise-software/layer7-api-management/api-developer-portal/4-3-2/install-configure-and-upgrade/scale-ca-api-portal/high-availability.html

I am trying to understand the requirement for submitting LB request.
For external Tenant on port 443, It states that LB has to forward the following headers to the portal. Host, Origin and Referer.
And The location header in the response of the portals should be changed to use the load balancer host name, for example, https://tenant2.portal.ca.com/admin/login should be changed to https://load.balancer.host.ca/admin/login 

Just trying to understand the flow here .. what should I provide to LB team for above configuration. 
Is this case applicable in the standalone API portal environments as well. 



Thanks,
Imran