Thank you, Intari, for a patch that implements the missing pieces of

Http-in and makes the host name for URL generation configurable.
Applied with changes:
llGetSimulatorHostname was not changed, because the change breaks
existing behavior and carries a data exposure risk. That value needs
to be configurable, the proposed fixed change is not acceptable.

bin/OpenSim.ini.example

@@ -305,6 +305,10 @@
     http_listener_sslport = 9001 ; Use this port for SSL connections
     http_listener_ssl_cert = "" ; Currently unused, but will be used for OSHttpServer
 
+    ; Hostname to use in llRequestURL/llRequestSecureURL
+    ; if not defined - default machine name is being used 
+    ; (on Windows this mean NETBIOS name - useably only inside local network)
+    ; ExternalHostNameForLSL=127.0.0.1
     ; Uncomment below to enable llRemoteData/remote channels
     ; remoteDataPort = 20800