Currently mod_auth_mellon can only utilize the HTTP-Redirect binding on the IdP's SingleLogoutService. Some IdP's (e.g. Keycloak) only support the HTTP-POST binding for SingleLogoutService. Mellon should be able to support HTTP-POST if instead of returning a redirect it returns a self-posting form with the SAML Logout Request embedded in it. The SAML specs suggest this methodology in their description of the HTTP-POST binding (we know this works because IdP's will respond to an AuthnRequest with a SAMLAssertion wrapped in a self posting form so it should work for Logout's as well)
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The feature has been implemented. It needs to be sent upstream for review.
FEDORA-2022-b90f2924b7 has been submitted as an update to Fedora 38. https://bodhi.fedoraproject.org/updates/FEDORA-2022-b90f2924b7
FEDORA-2022-b90f2924b7 has been pushed to the Fedora 38 stable repository. If problem still persists, please make note of it in this bug report.