added apache proxy address strategy as a config option

src/main/resources/application.yaml

@@ -28,6 +28,10 @@ spring:
 
 hapi:
   fhir:
+    ### enable to use the ApacheProxyAddressStrategy which uses X-Forwarded-* headers
+    ### to determine the FHIR server address
+#   use_apache_address_strategy: false
+#   use_apache_address_strategy_https: false
     ### enable to set the Server URL
 #    server_address: http://hapi.fhir.org/baseR4
     ### This is the FHIR version. Choose between, DSTU2, DSTU3, R4 or R5