allow empty redirect uris for confidential clients #3771
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Overview
Allow confidential clients to not require pre-registering their redirect URIs.
What this PR does / why we need it
The standards do not require that confidential clients have preregistered redirect URIs, that requirement is only for public clients. While confidential clients SHOULD use pre-configured redirect URIs, they are not essential their security. We also will not adopt wildcards in redirect URIs as per #448 since that would be an explicit violation of the standard.
Special notes for your reviewer