OAuthProvider

Return True when this provider owns server_url.

Return whether this provider can use a runtime loopback redirect URI.

When False, client_metadata() ignores the redirect_uri argument and uses the provider's own pre-registered static URI instead.

Return a fixed loopback port, or None for a random ephemeral port.

Override when the provider's app registration requires a specific pre-registered port (e.g. Slack registers http://localhost:3118/callback). Ignored when supports_loopback_callback() is False.

Return the OAuthClientMetadata used to build the auth provider.

Perform any provider-specific pre-handshake work.