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MALE SPEAKER: Todays question comes from Christian in Madrid, who asks, Whats Googles position about continuing to recommend the HTTP Vary User-Agent header for specific mobile websites after big players like Akamai said they dont cache the URLs that include it? Would you still recommend using it? OK, this is a pretty detailed topic, and its pretty esoteric, so lets see if we can unpack it and try to explain whats going on there. So first off, whats caching? Well, if you ask for a web page, and then you ask for the exact same web page three seconds later, why do all the work to re-compute what that web page might look like if youre doing a dynamic URL when you could save that content and just return the same content back to users? Now, you might need to re-compute that data once an hour or once a day or something like that, but once youve done the work to compute what a web page should look like, oftentimes, you can cache it. And so in the case when youre hitting a web ser
