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Add prefetch processing model, including double-key caching privacy protections #4115

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66a9f36
Add prefetch processing to HYMLLinkElement processing model, includin…
yoavweiss Oct 23, 2018
d1255bc
Get it to actuall build
yoavweiss Oct 23, 2018
aec29a8
keepalive to speculative
yoavweiss Mar 21, 2019
2f70c31
rebased on current link processing model
yoavweiss Mar 21, 2019
796bcd0
wattsi is happy
yoavweiss Mar 21, 2019
b9a07a2
Fix minor outstanding nits
domfarolino Jun 21, 2019
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Original file line number Diff line number Diff line change
Expand Up @@ -2815,6 +2815,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<li><dfn data-x="concept-request-replaces-client-id" data-x-href="https://fetch.spec.whatwg.org/#concept-request-replaces-client-id">replaces client id</dfn></li>
<li><dfn data-x="concept-request-initiator" data-x-href="https://fetch.spec.whatwg.org/#concept-request-initiator">initiator</dfn></li>
<li><dfn data-x="concept-request-destination" data-x-href="https://fetch.spec.whatwg.org/#concept-request-destination">destination</dfn></li>
<li><dfn data-x="request-speculative-flag" data-x-href="https://fetch.spec.whatwg.org/#request-speculative-flag">speculative flag</dfn></li>
<li><dfn data-x="request-service-workers-mode" data-x-href="https://fetch.spec.whatwg.org/#request-service-workers-mode">service-workers mode</dfn></li>
<li><dfn data-x="concept-potential-destination" data-x-href="https://fetch.spec.whatwg.org/#concept-potential-destination">potential destination</dfn></li>
<li><dfn data-x="concept-potential-destination-translate" data-x-href="https://fetch.spec.whatwg.org/#concept-potential-destination-translate">translating</dfn> a <span data-x="concept-potential-destination">potential destination</span></li>
<li><dfn data-x="concept-script-like-destination" data-x-href="https://fetch.spec.whatwg.org/#request-destination-script-like">script-like</dfn> <span data-x="concept-request-destination">destinations</span></li>
Expand Down Expand Up @@ -3188,6 +3190,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-descendant">shadow-including descendant</dfn>, and
<dfn data-x-href="https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-descendant">shadow-including inclusive descendant</dfn> concepts</li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-first-child">first child</dfn> and <dfn data-x-href="https://dom.spec.whatwg.org/#concept-tree-next-sibling">next sibling</dfn> concepts</li>
<li>The <dfn data-x="concept-document-origin" data-x-href="https://dom.spec.whatwg.org/#concept-document-origin"><code>origin</code></dfn></li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#document-element">document element</dfn> concept</li>
<li>The <dfn data-x-href="https://dom.spec.whatwg.org/#in-a-document-tree">in a document tree</dfn>, <dfn data-x-href="https://dom.spec.whatwg.org/#in-a-document">in a document</dfn> (legacy), and <dfn data-x-href="https://dom.spec.whatwg.org/#connected">connected</dfn> concepts</li>
<li>The <dfn data-x="concept-slot" data-x-href="https://dom.spec.whatwg.org/#concept-slot">slot</dfn> concept, and its <dfn data-x="slot-name" data-x-href="https://dom.spec.whatwg.org/#slot-name">name</dfn> and <dfn data-x-href="https://dom.spec.whatwg.org/#slot-assigned-nodes">assigned nodes</dfn></li>
Expand Down Expand Up @@ -24694,6 +24697,48 @@ document.body.appendChild(wbr);</code></pre>
keyword.</p>


<p>The <span>linked resource fetch setup steps</span> for this type of linked resource, given a
<code>link</code> element <var>el</var> and <span data-x="concept-request">request</span>
<var>request</var>, are:</p>

<ol>
<li><p>Set <var>request</var>'s <span data-x="concept-request-initiator">initiator</span>
to <code data-x="">prefetch</code>.</p></li>

<li><p>Set <var>request</var>'s <span data-x="request-speculative-flag">speculative</span> flag
to true.</p></li>

<li><p>Let <var>as</var> be the current state of <var>el</var>'s <code
data-x="attr-link-as">as</code> attribute.</p></li>

<li><p>Set <var>request</var>'s <span data-x="concept-request-destination">destination</span>
to the result of <span data-x="concept-potential-destination-translate">translating</span>
<var>as</var>.</p></li>

<li>
<p>If the browser is using both the <var>request</var>'s <span
data-x="concept-request-url">URL</span> and the
<span>top-level browsing context</span>'s <span>active document</span>'s <span
data-x="concept-document-origin">origin</span> as cache keys for <var>request</var>, then:</p>
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This is a little too vague. Which cache are we talking about?

Also, from your comment it seems this is talking about requestStorageAccess() type of isolation. I suspect we want to land some infrastructure for that first and agree on how it should work generally.

If that were in place, it's not clear to me why we'd modify redirect mode and such. It seems that might affect any cache in place in weird ways.

<ol>
<li><p>If <var>request</var>'s <span
data-x="concept-request-credentials-mode">credentials mode</span> is "include", then return
false.</p></li>
<li><p>If <var>request</var>'s <span
data-x="concept-request-referrer-policy">referrer policy</span> is not "no-referrer", then
return false.</p></li>
<li><p>If <var>request</var>'s <span data-x="concept-request-destination">destination</span>
is not "document", then return false.</p></li>
<li><p>Set <var>request</var>'s <span
data-x="concept-request-redirect-mode">redirect mode</span> to "manual".</p></li>
<li><p>Set <var>request</var>'s <span
data-x="request-service-workers-mode">service workers mode</span> to "none".</p></li>
</ol>
</li>

<li><p>Return true.</p></li>
</ol>

<h5>Link type "<dfn><code data-x="rel-preload">preload</code></dfn>"</h5>

<p>The <code data-x="rel-preload">preload</code> keyword may be used with <code>link</code>
Expand Down