Access-Control-Max-Age vs Cache-Control : <p>What is the difference between Access-Control-Max-Age and Cache-Control within a http response header?</p>

<pre><code>Access-Control-Max-Age:1728000
Cache-Control:max-age=21600, public
</code></pre>

<p>I have the feeling that they do not refer to the same thing, as often they appear together and sometimes with different values.</p>

<p>If they <em>do</em> both appear within a http header, but contain different values, would this be valid?</p>
