@Override
    protected String getSigningMediaType() {
        return MediaType.parseMediaType(OAuth20Constants.INTROSPECTION_JWT_HEADER_CONTENT_TYPE).getSubtype();
    }
This is {@link OidcTokenIntrospectionSigningAndEncryptionService}.

@author Misagh Moayyed
@since 7.0.0
support/cas-server-support-oidc-core-api/src/main/java/org/apereo/cas/oidc/profile/OidcTokenIntrospectionSigningAndEncryptionService.java