question: private void verifyTargetSessionIsLocalOrStateless ( SessionRequest req , SessionID sid ) throws SessionException , SessionRequestException , ForwardSessionRequestException { if ( statelessSessionManager . containsJwt ( sid ) ) { return ; } String hostServerID = foreignSessionHandler . getCurrentHostServer ( sid ) ; if ( ! serverConfig . isLocalServer ( hostServerID ) ) { try { throw new ForwardSessionRequestException ( forward ( SESSION_SERVICE_URL_SERVICE . getSessionServiceURL ( hostServerID ) , req ) ) ; } catch ( SessionException se ) { if ( ! sessionService . checkServerUp ( hostServerID ) ) { String retryHostServerID = foreignSessionHandler . getCurrentHostServer ( sid ) ; if ( retryHostServerID . equals ( hostServerID ) ) { throw se ; } else { if ( ! serverConfig . isLocalServer ( retryHostServerID ) ) { throw new ForwardSessionRequestException ( forward ( SESSION_SERVICE_URL_SERVICE . getSessionServiceURL ( hostServerID ) , req ) ) ; } } } else { throw se ; } } } if ( ! sessionService . checkSessionLocal ( sid ) ) { throw new SessionRequestException ( sid , SessionBundle . getString ( "sessionNotObtained" ) ) ; } }
target:  Verify that this server is the correct host for the session and the session can be found(or recovered) locally. This function will become much simpler with removal of home servers, or possibly no longer be required.