title: How to save firestore requests by using Http cache-control?
body: <p>Let's say i have a web/mobile app running firebase firestore database. </p>
  
  <p>My app is set to serve mostly <strong>dynamic content</strong> fully stored in firestore. </p>
  
  <p>So we are talking about caching dynamic content</p>
  
  <p>If a user load Page A, it's will make 1 request to firestore (for example). If this user go to Page B and then go back to Page A 5 minutes later, i don't want the app to make another request if the content has not changed.</p>
  
  <p>I heard about <code>http cache-control</code> headers but my concern is. If the cache control go check firestore to learn if the content is still the same, will this operation be counted as a request by firestore ?</p>