handleUser method
Implementation
void handleUser(String argument, FtpSession session) {
session.cachedUsername = argument;
session.isAuthenticated = false;
session.sendResponse('331 Password required for $argument');
}
void handleUser(String argument, FtpSession session) {
session.cachedUsername = argument;
session.isAuthenticated = false;
session.sendResponse('331 Password required for $argument');
}