From d0fa844f9198cfdcd2998aa9b07ed454c6618fb0 Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Sun, 17 Nov 2019 11:12:33 +0900
Subject: [PATCH] Fix #6806: linkcheck: Failure on parsing content

---
 CHANGES                      | 1 +
 sphinx/builders/linkcheck.py | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/CHANGES b/CHANGES
index a1676d5d6..dc56e3cf9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -48,6 +48,7 @@ Bugs fixed
   supported LaTeX engines: ¶, §, €, ∞, ±, →, ‣, –, superscript and subscript
   digits go through "as is" (as default OpenType font supports them)
 * #6704: linkcheck: Be defensive and handle newly defined HTTP error code
+* #6806: linkcheck: Failure on parsing content
 * #6655: image URLs containing ``data:`` causes gettext builder crashed
 * #6584: i18n: Error when compiling message catalogs on Hindi
 * #6718: i18n: KeyError is raised if section title and table title are same
diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index 635d9df98..737079a02 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -59,6 +59,9 @@ def check_anchor(response: requests.requests.Response, anchor: str) -> bool:
     # Read file in chunks. If we find a matching anchor, we break
     # the loop early in hopes not to have to download the whole thing.
     for chunk in response.iter_content(chunk_size=4096, decode_unicode=True):
+        if isinstance(chunk, bytes):    # requests failed to decode
+            chunk = chunk.decode()      # manually try to decode it
+
         parser.feed(chunk)
         if parser.found:
             break