From 2f3d04d3713f6cd0f89d491217175b55911927be Mon Sep 17 00:00:00 2001
From: Jake Archibald <jaffathecake@gmail.com>
Date: Wed, 6 Jun 2018 08:26:21 +0100
Subject: [PATCH] Specify identity encoding for range requests

Tests: https://github.com/web-platform-tests/wpt/pull/11291.

Fixes #747.
---
 fetch.bs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/fetch.bs b/fetch.bs
index be1fd4918..9468109d0 100644
--- a/fetch.bs
+++ b/fetch.bs
@@ -3652,8 +3652,19 @@ Range Requests</cite>. [[HTTP-RANGE]] However, this is not widely supported by b
     </ol>
 
    <li>
-    <p>Modify <var>httpRequest</var>'s
-    <a for=request>header list</a> per HTTP.
+    <p>If <var>httpRequest</var>'s <a for=request>header list</a> <a for="header list">contains</a>
+    `<code>Range</code>`, then <a for="header list">append</a>
+    `<code>Accept-Encoding</code>`/`<code>identity</code>` to <var>httpRequest</var>'s
+    <a for=request>header list</a>.
+
+    <p class="note no-backref"><a href="https://jakearchibald.github.io/accept-encoding-range-test/">Many servers</a>
+    mistakenly ignore `<code>Range</code>` headers if a non-identity encoding is accepted.
+
+   <li>
+    <p>Modify <var>httpRequest</var>'s <a for=request>header list</a> per HTTP. Do not
+    <a for="header list">append</a> a given <a>header</a> if <var>httpRequest</var>'s
+    <a for=request>header list</a> <a for="header list">contains</a> that <a>header</a>'s
+    <a for=header>name</a>.
 
     <p class="note no-backref">It would be great if we could make this more normative
     somehow. At this point <a for=/>headers</a> such as