Re: [whatwg/fetch] Stop lowercasing header names (#476)

annevk commented on this pull request.



> -<a>header</a> whose <a for=header>name</a>
-is <var>name</var>, <a lt="byte-lowercase">byte-lowercased</a>, and
-<a for=header>value</a> is <var>value</var>, to
-<var>list</var>.
+<a for=header>name</a>/<a for=header>value</a> (<var>name</var>/<var>value</var>) pair to a
+<a for=/>header list</a> (<var>list</var>), run these steps:
+
+<ol>
+ <li>
+  <p>If <var>list</var> <a for="header list">contains</a> <var>name</var>, then set <var>name</var>
+  to the first such <a>header</a>'s <a for=header>name</a>.
+
+  <p class="note no-backref">This reuses the casing of the <a for=header>name</a> of the
+  <a>header</a> already in the <a for=/>header list</a>, if any. If there are multiple matched
+  <a>headers</a> their <a for=header>names</a> will all be identical.
+  <!-- XXX Firefox and Safari adjust known header names too. -->

Note that all browsers currently make it observable through `getAllResponseHeaders()` so we might still get stuck there one way or another.

If we are to allow the user agent to pick casing for well-known headers I think we should probably standardize that and get everyone on board. Seems like it would be best done as a new issue.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/pull/476