Hello !
When running performance tests on a website just about to launch, I have seen the same error appear everywhere: There is no set cache expiry date.
Google tells me this:
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Now I’ve searched as best as I could the forums and docs but didn’t find anything to guide me in the right direction here. Any help? Does this warning matter?