Re: [whatwg/fetch] Add TAO check (#955)

npm1 commented on this pull request.



> @@ -5075,6 +5083,34 @@ agent's <a>CORS-preflight cache</a> for which there is a <a>cache entry match</a
 </ol>
 
 
+<h3 id=tao-check>TAO check</h3>
+
+<p>To perform a <dfn id=concept-tao-check>TAO check</dfn> for a <var>request</var> and
+<var>response</var>, run these steps:
+
+<ol>
+ <li><p>If <var>response</var>'s <a for=request>timing allow failed flag</a> is set, then return
+ failure.
+
+ <li><p>If <var>request</var>'s <a for=request>tainted origin flag</a> is unset and
+ <var>response</var>'s <a for=response>location URL</a>'s <a for=url>origin</a> is
+ <a>same origin</a> with <var>request</var>'s <a for=request>origin</a>, then return success.

Yea that makes sense. Should we still use 'serializing a request origin' then, or perhaps avoid effects from the 'tainted origin flag' altogether here? In our current behavior, that's what we do.

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