public Map<String, String> ignoredExtensions() {
        return Collections.unmodifiableMap(subtractMap(subtractMap(inputExtensions.map(), invalidExtensions), validatedExtensions));
    }
@return An immutable {@link Map} consisting of the extensions that have neither been validated nor invalidated
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/OAuthBearerExtensionsValidatorCallback.java