The whole scenario is that the chat server will communicate with the external database through a dynamic application, like PHP, ASP, ASP.net or JSP. The auth-url is the abbreviation of authentication URL.
You are strongly recommended to integrate with this way as it is simple and stable. It requires you to be familiar with your own database, and capable of coding dynamic webpage. The sample of the auth-url dynamic webpage is available, simply and you can send email to firstname.lastname@example.org to request.
Auth URL Output:
Note: Dealing with guest login, the auth-url will get no password and fail to find any username in the database, in that case, auth-url should respond with 4 to ensure the user to enter chat room smoothly. If respond 0, 1 or 5, the chat server will decide the username is already taken and decline the user's connection effort.
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