Re: [w3ctag/design-reviews] Design Review: Speculation Rules (Prefetch) (Issue #721)

#611 was the corresponding early review. We're [hoping to ship in Chrome relatively soon](https://groups.google.com/a/chromium.org/g/blink-dev/c/3Ga0Y2BEz7E/m/3U5zwXjWGwAJ).

So far most of the feedback I'm aware of can largely be bucketed as:
* related to the effect on the page which was prefetched (unsurprisingly, most obviously reduced load time metrics)
* servers wanting to identify and drop prefetch traffic (resulting in writing down a `Sec-Purpose` header to replace vendor-specific headers, and [not storing non-ok responses by default](https://wicg.github.io/nav-speculation/prefetch.html#supports-prefetch))
* servers receiving anonymized traffic (much of which is presently tracked in https://github.com/buettner/private-prefetch-proxy, such as https://buettner.github.io/private-prefetch-proxy/traffic-advice.html to limit traffic from polite proxies)

We've asked on multiple occasions for engagement from other vendors, though there hasn't been a lot. The [WICG proposal](https://github.com/WICG/proposals/issues/2) for this repository captures some of that. We've requested Mozilla and WebKit positions, without response.

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