Index: Lib/http/cookies.py
===================================================================
--- Lib/http/cookies.py	(revision 87316)
+++ Lib/http/cookies.py	(working copy)
@@ -173,6 +173,11 @@
     '\033' : '\\033',  '\034' : '\\034',  '\035' : '\\035',
     '\036' : '\\036',  '\037' : '\\037',
 
+    # Because of the way browsers really handle cookies (as opposed
+    # to what the RFC says) we also encode , and ;
+
+    ',' : '\\054', ';' : '\\073', 
+
     '"' : '\\"',       '\\' : '\\\\',
 
     '\177' : '\\177',  '\200' : '\\200',  '\201' : '\\201',
Index: Lib/test/test_http_cookies.py
===================================================================
--- Lib/test/test_http_cookies.py	(revision 87316)
+++ Lib/test/test_http_cookies.py	(working copy)
@@ -69,6 +69,14 @@
         </script>
         """)
 
+    def test_extended_encode(self):
+        # Issue 9824: some browsers don't follow the standard; we now
+        # encode , and ; to keep them from tripping up.
+        C = cookies.SimpleCookie()
+        C['val'] = "some,funky;stuff"
+        self.assertEqual(C.output(['val']),
+            'Set-Cookie: val="some\\054funky\\073stuff"')
+
     def test_special_attrs(self):
         # 'expires'
         C = cookies.SimpleCookie('Customer="WILE_E_COYOTE"')