Content Security Policy prevent SAML redirection
When trying SAML with POST, the autopost is not working because of CSP:
Content Security Policy: Les paramètres de la page ont empêché le chargement d’une ressource à http://mellon.example.com/mellon/postResponse (« form-action https://auth.openid.club https://mellon.example.com https://mellon.example.com »).