public SamlIdentityProviderConfigBuilder sloReqEndpoint(SamlEndpoint sloReqEndpoint) {
        this.sloReqEndpoint = requireNonNull(sloReqEndpoint, "sloReqEndpoint");
        return this;
    }
Sets a single logout request endpoint of an identity provider.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlIdentityProviderConfigBuilder.java