The authentication method was via username and password, I finally solved it by inserting a production in between, in order to forward the request to my webapp by putting the cookie in the header, as it expects.

Thanks @Tani Frankel ! That was a great suggestion, so I updated the article to include this approach.

Yes, i got protect error when i tried access SYS. Is there a way to assign privilege to access a specific table to another user?