Discovery: Add application_types_supported to OP metadata?

[Vladimir Dzhuvinov]

The discovery document has no mean to advertise which application types the OP supports. In our server we have a setting to limit registrations to web apps only.

[Nat Sakimura]

In Registration, there is an entry specifying types of apps.

So, application_types_supported in Discovery makes sense though it has to be enforced with redirect_uri.

It will be just informational, and not really useful at run time.

This kind of information should be given in the developer documentation instead.

Suitable error response in Registration would be useful.