title: How is Cache-Control: max-age affected by intermediate caching?
body: <p>I am currently serving an HTML page to users with a <code>Cache-Control: max-age=600</code> header. I believe this allows the users' browsers to cache the page for a maximum of 10 minutes.</p>
  
  <p>I am considering adding a CDN in front of my server which, due to the above header, should also cache the page for a maximum of 10 minutes.</p>
  
  <p>If a user obtains the page when it has been in the CDN cache for 9 minutes, say, will it still be cached in the browser for 10 minutes, giving a total cached time of 19 minutes? Or will it only be cached in the browser for 1 minute?</p>