title: "no-cache" ​vs "max-age=0, must-revalidate, proxy-revalidate"
body: <p>What's the​ difference between a HTTP response with <code>Cache-Control: no-cache</code> vs <code>Cache-Control: max-age=0, must-revalidate, proxy-revalidate</code>?</p>
  
  <p>Do browsers treat that as <em>identical</em>?</p>