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[3.14] gh-79638: Restore "Treat an unreachable robots.txt as disallow all" (GH-152525) #153108

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Merged
serhiy-storchaka merged 1 commit into from
Jul 5, 2026
+11 −1
Merged

[3.14] gh-79638: Restore "Treat an unreachable robots.txt as disallow all" (GH-152525) #153108

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10 changes: 9 additions & 1 deletion Lib/urllib/robotparser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,9 +65,17 @@ def read(self):
f = urllib.request.urlopen(self.url)
except urllib.error.HTTPError as err:
if err.code in (401, 403):
# If access to robot.txt has the status Unauthorized/Forbidden,
# then most likely this applies to the entire site.
self.disallow_all = True
elif err.code >= 400 and err.code < 500:
elif 400 <= err.code < 500:
# RFC 9309, Section 2.3.1.3: the crawler MAY access any
# resources on the server.
self.allow_all = True
elif 500 <= err.code < 600:
# RFC 9309, Section 2.3.1.4: the crawler MUST assume
# complete disallow.
self.disallow_all = True
err.close()
else:
raw = f.read()
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-09-05-20-50-35.gh-issue-79638.Y-JfaH.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Disallow all access in :mod:`urllib.robotparser` if the ``robots.txt`` file
is unreachable due to server or network errors.
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