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From Joshua Marantz <>
Subject Re: Emitting Cache-Control: immutable
Date Wed, 29 Nov 2017 14:30:41 GMT
This sounds like a reasonable idea to me.  I agree that .pagespeed. URLs
are a good candidate for this, as long as the hash is matching and
therefore we are sending 1-year caching directives.

However I'm confused why about why revalidation would be needed in such
cases, even without 'immutable', unless the item has been in cache for >1

On Thu, Nov 23, 2017 at 3:33 PM, Otto van der Schaaf <>

> Hi all,
> I wanted to discuss emitting the "immutable" cache-control directive in
> responses for requests to .pagespeed. urls.
> After reading up on this fairly new cache-control directive, think we may
> be able to avoid revalidations by doing so.
> The RFC mentions versioned urls as a candidate for doing this, which I
> think also includes our fingerprinted .pagespeed. urls
> (these have a hash that changes when any of the underlying resources
> change)
> Rough implementation:
> cc-immutable?expand=1
> Context:
> caching-to-speed-up-the-web/
> Would love to hear thoughts on this!
> Otto

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