Multiple cookies can have the same name

tests/test_wrappers.py

@@ -29,7 +29,7 @@
 from werkzeug.wsgi import LimitedStream, wrap_file
 from werkzeug.datastructures import (
     MultiDict, ImmutableOrderedMultiDict,
-    ImmutableList, ImmutableTypeConversionDict, CharsetAccept,
+    ImmutableList, ImmutableMultiDict, CharsetAccept,
     MIMEAccept, LanguageAccept, Accept, CombinedMultiDict, Headers,
 )
 from werkzeug.test import Client, create_environ, run_wsgi_app
@@ -1071,10 +1071,13 @@ class MyRequest(wrappers.Request):
     assert req.values['foo'] == u'baz'
 
     req = wrappers.Request.from_values(headers={
-        'Cookie':   'foo=bar'
+        'Cookie':   'foo=bar;foo=baz'
     })
-    assert type(req.cookies) is ImmutableTypeConversionDict
-    assert req.cookies == {'foo': 'bar'}
+    assert type(req.cookies) is ImmutableMultiDict
+    assert req.cookies.to_dict() == {'foo': 'bar'}
+
+    # it is possible to have multiple cookies with the same name
+    assert req.cookies.getlist('foo') == ['bar', 'baz']
     assert type(req.access_route) is ImmutableList
 
     MyRequest.list_storage_class = tuple

werkzeug/wrappers/base_request.py

@@ -10,7 +10,6 @@
 from ..datastructures import EnvironHeaders
 from ..datastructures import ImmutableList
 from ..datastructures import ImmutableMultiDict
-from ..datastructures import ImmutableTypeConversionDict
 from ..datastructures import iter_multi_items
 from ..datastructures import MultiDict
 from ..formparser import default_stream_factory
@@ -119,11 +118,11 @@ class Request(BaseRequest, ETagRequestMixin):
 
     #: the type to be used for dict values from the incoming WSGI environment.
     #: By default an
-    #: :class:`~werkzeug.datastructures.ImmutableTypeConversionDict` is used
+    #: :class:`~werkzeug.datastructures.ImmutableMultiDict` is used
     #: (for example for :attr:`cookies`).
     #:
     #: .. versionadded:: 0.6
-    dict_storage_class = ImmutableTypeConversionDict
+    dict_storage_class = ImmutableMultiDict
 
     #: The form data parser that shoud be used.  Can be replaced to customize
     #: the form date parsing.