Retryable
A request with client authentication or an access token, sent again with fresh authentication headers when the server asks for a DPoP nonce (RFC 9449, 8 and 9) or an attestation challenge (draft-ietf-oauth-attestation-based-client-auth-10, 6.2). attempt starts at 0 for the first attempt of a request, and is increased for each retry of the same request. A fallback to another request, e.g. AuthorizationServerMetadata with AuthorizationServerMetadata.openidConfiguration, is not a retry.