Re: [whatwg/fetch] Define the response Content-Type header parser (#831)

annevk commented on this pull request.



> +<p>To
+<dfn export for="header list" lt="extract a MIME type|extracting a MIME type" id=concept-header-extract-mime-type>extract a MIME type</dfn>
+from a <a for=/>header list</a> <var>headers</var>, run these steps:
+
+<ol>
+ <li><p>Let <var>charset</var> be null.
+
+ <li><p>Let <var>essence</var> be null.
+
+ <li><p>Let <var>mimeType</var> be null.
+
+ <li><p>Let <var>values</var> be the result of
+ <a for="header list">getting, decoding, and splitting</a> `<code>Content-Type</code>` from
+ <var>headers</var>.
+
+ <li><p>If <var>values</var> is null, then return failure.

A heading that is missing is typically not a failure case.

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