requires 3-4 round trips – Get closer to the users • You can’t optimise across multiple origins – Even as HTTP improves, you will still need separate connections to each origin – Use a smaller number of origins • Requests are getting cheaper – Don’t worry so much about number of requests Bottom line
for the home page One request goes to origin. The rest are held at the edge. Future requests served from fresh cache After expiry, requests still get fast cached response Asynchronous fetch to refresh the cache Cache repopulated Does not wait for origin response!
Requests flooding in Just one request goes to origin, populates cache at the edge Request after expiry causes fetch to origin Origin server is offline, refuses connection stale-while-reval expires SERVER DOWN! Server super-stale object from cache Fall back to stale content