How to use CoreResponseMode?

[maxammann]

Implementing an OIDC flow right now. Is there a better way to set response mode than:

        let (authorize_url, csrf_state, nonce) = self
            .client
            .authorize_url(
                AuthenticationFlow::<CoreResponseType>::AuthorizationCode,
                CsrfToken::new_random,
                Nonce::new_random,
            )
            .add_extra_param("response_mode", CoreResponseMode::FormPost.as_ref())
            .url();