From 4f43832180a144d9c4494bec69842df09118890e Mon Sep 17 00:00:00 2001
From: Ashley Harvey <ashley@ashleyharvey.ca>
Date: Tue, 3 Sep 2019 20:33:21 -0700
Subject: [PATCH 1/5] Patch cookiejar.py; relax case-sensitive regex on an
 inconsequential line in the cookie file.

---
 Lib/http/cookiejar.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/http/cookiejar.py b/Lib/http/cookiejar.py
index db8238235718133..e07a4cb1bc37ecc 100644
--- a/Lib/http/cookiejar.py
+++ b/Lib/http/cookiejar.py
@@ -1999,7 +1999,7 @@ class MozillaCookieJar(FileCookieJar):
     header by default (Mozilla can cope with that).
 
     """
-    magic_re = re.compile("#( Netscape)? HTTP Cookie File")
+    magic_re = re.compile("#( Netscape)? HTTP Cookie File", re.IGNORECASE)
     header = """\
 # Netscape HTTP Cookie File
 # http://curl.haxx.se/rfc/cookie_spec.html

From 7e6523e010cb7dbb0ce6bf01857af9abe82c62a0 Mon Sep 17 00:00:00 2001
From: Ashley Harvey <ashley@ashleyharvey.ca>
Date: Tue, 3 Sep 2019 20:45:07 -0700
Subject: [PATCH 2/5] Added self to ACKS.

---
 Misc/ACKS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Misc/ACKS b/Misc/ACKS
index ce8b144900ebc02..eeb50e6f414a4b0 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1888,3 +1888,4 @@ Robert Leenders
 Tim Hopper
 Dan Lidral-Porter
 Ngalim Siregar
+Ashley Harvey

From 5181e0f2a1660f8f71e02f3b0482a1d46bacdb9e Mon Sep 17 00:00:00 2001
From: Ashley Harvey <ashley@ashleyharvey.ca>
Date: Wed, 4 Sep 2019 14:14:23 -0700
Subject: [PATCH 3/5] Change position of name to comply with sorting in
 Misc/ACKs

---
 Misc/ACKS | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Misc/ACKS b/Misc/ACKS
index eeb50e6f414a4b0..36da1fceb39141f 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -646,6 +646,7 @@ David Harrigan
 Brian Harring
 Jonathan Hartley
 Travis B. Hartwell
+Ashley Harvey
 Shane Harvey
 Larry Hastings
 Tim Hatch
@@ -1888,4 +1889,3 @@ Robert Leenders
 Tim Hopper
 Dan Lidral-Porter
 Ngalim Siregar
-Ashley Harvey

From b37b256abfad87da96977af732c618c2ad9d0f61 Mon Sep 17 00:00:00 2001
From: Oleg Iarygin <oleg@arhadthedev.net>
Date: Sat, 11 Feb 2023 09:49:59 +0400
Subject: [PATCH 4/5] Add a news entry

---
 .../next/Library/2023-02-11-09-49-49.gh-issue-82039.caTE7O.rst  | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2023-02-11-09-49-49.gh-issue-82039.caTE7O.rst

diff --git a/Misc/NEWS.d/next/Library/2023-02-11-09-49-49.gh-issue-82039.caTE7O.rst b/Misc/NEWS.d/next/Library/2023-02-11-09-49-49.gh-issue-82039.caTE7O.rst
new file mode 100644
index 000000000000000..cb75ae83780eaf6
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-02-11-09-49-49.gh-issue-82039.caTE7O.rst
@@ -0,0 +1,2 @@
+:meth:`http.cookiejar.FileCookieJar.load` now checks the first, format
+signature line in a case-insensitive manner. Patch by Ashley Harvey.

From 5f6f42a82ec7cd1b380d738cfd795ed005be330a Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Tue, 11 Aug 2026 19:25:29 +0300
Subject: [PATCH 5/5] Match the signature line only in ASCII, and add tests

---
 Lib/http/cookiejar.py           |  2 +-
 Lib/test/test_http_cookiejar.py | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/Lib/http/cookiejar.py b/Lib/http/cookiejar.py
index 29ee436f71afe14..302bd3676a8144d 100644
--- a/Lib/http/cookiejar.py
+++ b/Lib/http/cookiejar.py
@@ -54,7 +54,7 @@ def _debug(*args):
 HTTPONLY_PREFIX = "#HttpOnly_"
 DEFAULT_HTTP_PORT = str(http.client.HTTP_PORT)
 NETSCAPE_MAGIC_RGX = re.compile("#( Netscape)? HTTP Cookie File",
-                                re.IGNORECASE)
+                                re.IGNORECASE | re.ASCII)
 MISSING_FILENAME_TEXT = ("a filename was not supplied (nor was the CookieJar "
                          "instance initialised with one)")
 NETSCAPE_HEADER_TEXT =  """\
diff --git a/Lib/test/test_http_cookiejar.py b/Lib/test/test_http_cookiejar.py
index 04cb440cd4ccf66..7f39b5c772bd10f 100644
--- a/Lib/test/test_http_cookiejar.py
+++ b/Lib/test/test_http_cookiejar.py
@@ -459,6 +459,31 @@ def test_bad_magic(self):
         finally:
             os_helper.unlink(filename)
 
+    def test_magic_ignores_case(self):
+        filename = os_helper.TESTFN
+        self.addCleanup(os_helper.unlink, filename)
+        for magic in ("# Netscape HTTP Cookie File",
+                      "# netscape http cookie file",
+                      "# HTTP Cookie File",
+                      "# http cookie file"):
+            with self.subTest(magic=magic):
+                with open(filename, "w") as f:
+                    f.write(magic + "\n")
+                MozillaCookieJar().load(filename)
+
+    def test_magic_is_not_unicode(self):
+        # Unicode case folding must not be used: 'ſ' (U+017F) and 'K'
+        # (U+212A) are case-insensitively equal to 's' and 'k' in Unicode.
+        filename = os_helper.TESTFN
+        self.addCleanup(os_helper.unlink, filename)
+        for magic in ("# Netſcape HTTP Cookie File",
+                      "# Netscape HTTP CooKie File"):
+            with self.subTest(magic=magic):
+                with open(filename, "w", encoding="utf-8") as f:
+                    f.write(magic + "\n")
+                self.assertRaises(LoadError, MozillaCookieJar().load, filename)
+
+
 class CookieTests(unittest.TestCase):
     # XXX
     # Get rid of string comparisons where not actually testing str / repr.