From 3fccfa7aeb420779df762121438b5bbc4f809deb Mon Sep 17 00:00:00 2001
From: Dan Robertson <dan@dlrobertson.com>
Date: Thu, 5 May 2022 02:12:14 +0000
Subject: [PATCH] Only allow blob: URLs that have a backing blob

Document the need to return a network error on fetch if the blob URL has
no backing blob.
---
 fetch.bs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fetch.bs b/fetch.bs
index 6471179cb..20f888059 100644
--- a/fetch.bs
+++ b/fetch.bs
@@ -4503,12 +4503,14 @@ steps:
     <a for="fetch params">canceled</a>:
 
     <ol>
-     <li><p>Let <var>blob</var> be <var>request</var>'s <a for=request>current URL</a>'s
-     <a for=url>blob URL entry</a>'s <a for="blob URL entry">object</a>.
+     <li><p>Let <var>blobURLEntry</var> be <var>request</var>'s <a for=request>current URL</a>'s
+     <a for=url>blob URL entry</a>.
 
      <li>
-      <p>If <var>request</var>'s <a for=request>method</a> is not `<code>GET</code>` or
-      <var>blob</var> is not a {{Blob}} object, then return a <a>network error</a>. [[!FILEAPI]]
+      <p>If <var>request</var>'s <a for=request>method</a> is not `<code>GET</code>`,
+      <var>blobURLEntry</var> is null, or <var>blobURLEntry</var>'s
+      <a for="blob URL entry">object</a> is not a {{Blob}} object, then return a
+      <a>network error</a>. [[!FILEAPI]]
 
       <p class=note>The `<code>GET</code>` <a for=/>method</a> restriction serves no useful purpose
       other than being interoperable.