doc/CHANGES.txt

@@ -31,6 +31,8 @@ Zope Changes
 
     Bugs Fixed
 
+      - Collector #1864, #1906: fixed header normalization in appendHeader()
+
       - Collector #1899: fixed migration issue when using export/import for
         ZCatalog instances
 

lib/python/ZPublisher/HTTPResponse.py

@@ -544,7 +544,7 @@ class HTTPResponse(BaseResponse):
         Sets an HTTP return header "name" with value "value",
         appending it following a comma if there was a previous value
         set for the header. '''
-        name = str(name)
+        name = str(name).lower()
         value = str(value)
 
         headers = self.headers

lib/python/ZPublisher/tests/testHTTPResponse.py

@@ -65,6 +65,16 @@ class HTTPResponseTests(unittest.TestCase):
         self.assertEqual(cookie.get('value'), 'bar:baz')
         self.assertEqual(cookie.get('path'), '/')
 
+    def test_appendHeader(self):
+        response = self._makeOne()
+        response.setHeader('foo', 'bar')
+        response.appendHeader('foo', 'foo')
+        self.assertEqual(response.headers.get('foo'), 'bar,\n\tfoo')
+        response.setHeader('xxx', 'bar')
+        response.appendHeader('XXX', 'foo')
+        self.assertEqual(response.headers.get('xxx'), 'bar,\n\tfoo')
+
+
 def test_suite():
     suite = unittest.TestSuite()
     suite.addTest(unittest.makeSuite(HTTPResponseTests, 'test'))