Called by Lightstreamer Kernel, through the Remote Server, instead of calling the 3-arguments version, in case the Server has been instructed to acquire the client principal from the client TLS/SSL certificate through the <use_client_auth> configuration flag. 

Note that the above flag can be set for each listening port independently (and it can be set for TLS/SSL ports only), hence, both overloads may be invoked, depending on the port used by the client. 

Also note that in case client certificate authentication is not forced on a listening port through <force_client_auth>, a client request issued on that port may not be authenticated, hence it may have no principal associated. In that case, if <use_client_auth> is set, this overload will still be invoked, with null principal. 

See the base 3-arguments version for other notes. 

Edition Note: https connections is an optional feature, available depending on Edition and License Type. To know what features are enabled by your license, please see the License tab of the Monitoring Dashboard (by default, available at /dashboard). 

void NotifyUser(string user, string password, IDictionary httpHeaders, string clientPrincipal);

void NotifyUser(string user, string password, IDictionary httpHeaders, string clientPrincipal);

Function NotifyUser(user As string, password As string, httpHeaders As IDictionary, clientPrincipal As string) As void