The XSA application has to be accessed via an external load balancer / reverse proxy, but during authentication the UAA server internal address is used.
SAP HANA XS Advanced
XSUAA, xsuaaserver, uaa_url, additional_domain_names , KBA , BC-XS-SEC , UAA and Security for HANA XSA engine , BC-XS-RT , OP Runtime / XS Controller , How To
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