Thanks for your answers and the pleasant and informative stuff you are sharing. The weirdest thing is that the 3 first days the app were deployed was working normaly and the next morning i woke up i got the error (browser’s one). That’s why i started this thread. 
also for a weird reason the page was reported for phising 
it’s just a project i want to share with some prof’s before finalize it’s build etc
FTP are essentially a limited version of SSH, and there has to be codes that allow custom text responses, and with a custom client expected to be able to handle those special feedback, it’s up to the client whether to catch these responses. Response codes like 214 and 220 both allow custom text and with other clients not having special behavior upon receive. 220 is preferred in this case as those are often used as welcome message during the initial connection.
As per testing, sending a 220 after a connection has been made does not have any impact and is ignored because the connection is already established, however since we want the custom client to show something, it can then be custom-coded.
Read:
Yes, we sometimes chit-chat technical stuff like this on this community, 
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