paraphrase rfcs/code better
module="mod_cache">CacheEnable</directive> and <directive
module="mod_cache">CacheDisable</directive> directives.</li>
- <li>The response must have a HTTP status code of 200, 203, 300, 301 or
- 410.</li>
+ <li>If the response has an HTTP status code other than 200, 203, 300,
+ 301 or 410 it must also specify "Expires" or "Cache-Control" header.
+ </li>
<li>The request must be a HTTP GET request.</li>
