@Override
        public void ensureValid(String name, Object value) {
            String strValue = (String) value;
            if (Utils.isBlank(strValue)) {
                return;
            }

            String[] configs = StringUtil.csvSplit(strValue); // handles and removed surrounding quotes
            Arrays.stream(configs).forEach(RestServerConfig::validateHttpResponseHeaderConfig);
        }
Add the properties related to an internal-only server to the given {@link ConfigDef}.
@param configDef the {@link ConfigDef} to add the properties to; may not be null
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/rest/RestServerConfig.java