handleSite method
SITE: Execute site-specific commands (RFC 959). This server does not implement any site-specific commands.
Implementation
void handleSite(String argument, FtpSession session) {
if (argument.isEmpty) {
session.sendResponse('501 Syntax error in parameters');
return;
}
// No site-specific commands are implemented
session.sendResponse('502 SITE command not implemented');
}