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Add algorithm to extract an encoding from a MIME type #1447

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Jun 1, 2022
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Add algorithm to extract an encoding from a MIME type #1447

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Add algorithm to extract an encoding from a MIME type
annevk Jun 1, 2022
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nit
annevk Jun 1, 2022
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24 changes: 24 additions & 0 deletions fetch.bs
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Expand Up @@ -3491,6 +3491,30 @@ Content-Type:
</table>
</div>

<p>To <dfn export>legacy extract an encoding</dfn> given failure or a <a for=/>MIME type</a>
<var>mimeType</var> and an <a for=/>encoding</a> <var>fallbackEncoding</var>, run these steps:

<ol>
<li><p>If <var>mimeType</var> is failure, then return <var>fallbackEncoding</var>.

<li><p>If <var>mimeType</var>["<code>charset</code>"] does not <a for=map>exist</a>, then return
<var>fallbackEncoding</var>.

<li><p>Let <var>tentativeEncoding</var> be the result of <a for=/>getting an encoding</a> from
<var>mimeType</var>["<code>charset</code>"].

<li><p>If <var>tentativeEncoding</var> is failure, then return <var>fallbackEncoding</var>.

<li><p>Return <var>tentativeEncoding</var>.
</ol>

<div class=note>
<p>This algorithm allows <var>mimeType</var> to be failure so it can be more easily combined with
<a>extract a MIME type</a>.

<p>It is denoted as legacy as modern formats are to exclusively use <a for=/>UTF-8</a>.
</div>


<h3 id=x-content-type-options-header>`<code>X-Content-Type-Options</code>` header</h3>

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