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Only expose iframe body size for same-origin navigations without cross-origin redirects #1961

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Only expose iframe body size for same-origin navigations without cross-origin redirects #1961

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28 changes: 23 additions & 5 deletions fetch.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -5268,8 +5268,6 @@ steps:

<li><p>Let <var>cacheState</var> be <var>response</var>'s <a for=response>cache state</a>.

<li><p>Let <var>bodyInfo</var> be <var>response</var>'s <a for=response>body info</a>.

<li>
<p>If <var>response</var>'s <a for=response>timing allow passed flag</a> is not set,
then set <var>timingInfo</var> to the result of <a>creating an opaque timing info</a> for
Expand All @@ -5279,14 +5277,28 @@ steps:

<li><p>Let <var>responseStatus</var> be 0.

<li><p>Let <var>bodyInfo</var> be a new <a for=/>response body info</a>.

<li>
<p>If <var>fetchParams</var>'s <a for="fetch params">request</a>'s <a for=request>mode</a> is
not "<code>navigate</code>" or <var>response</var>'s
<a for=response>redirect taint</a> is "<code>same-origin</code>":
<p>If one of the following is true

<ul class=brief>
<li><p><var>fetchParams</var>'s <a for="fetch params">request</a>'s
<a for=request>mode</a> is not "<code>navigate</code>".

<li><p><var>response</var>'s <a for=response>URL</a>'s
<a for=url>origin</a> is <a>same origin</a> with <var>fetchParams</var>'s
<a for="fetch params">request</a>'s <a for=request>origin</a> and <var>response</var>'s
<a for=response>redirect taint</a> is "<code>same-origin</code>".
</ul>

<p>then:

<ol>
<li><p>Set <var>responseStatus</var> to <var>response</var>'s <a for=response>status</a>.

<li><p>Set <var>bodyInfo</var> to <var>response</var>'s <a for=response>body info</a>.

<li><p>Let <var>mimeType</var> be the result of
<a for="header list">extracting a MIME type</a> from <var>response</var>'s
<a for=response>header list</a>.
Expand All @@ -5296,6 +5308,12 @@ steps:
<a>minimizing a supported MIME type</a> given <var>mimeType</var>.
</ol>

<p class=note>For cross-origin "<code>no-cors</code>" requests, <var>response</var> is an
<a>opaque filtered response</a>, whose <a for=response>status</a> is already 0 and whose
<a for=response>body info</a> is already a new <a for=/>response body info</a>. The actual
status and body info are in <var>response</var>'s
<a for="filtered response">internal response</a> and are not exposed.

<li><p>If <var>fetchParams</var>'s <a for="fetch params">request</a>'s
<a for=request>initiator type</a> is non-null, then <a for=/>mark resource timing</a> given
<var>timingInfo</var>, <var>fetchParams</var>'s <a for="fetch params">request</a>'s
Expand Down