not only that, but even when you have a resource with a long cache time, and cache-control public, the browser will still do a request for the file headers (a c

not only that, but even when you have a resource with a long cache time, and cache-control public, the browser will still do a request for the file headers (a conditional request - one that serves the content if it has changed/doesn't match what the browser expects) so an immutable resource wouldn't even need that request