request.header objects don't support the standard keys() method of dicts

requests/structures.py

@@ -8,57 +8,21 @@
 
 """
 
-from UserDict import DictMixin
-
-
-class CaseInsensitiveDict(DictMixin):
+class CaseInsensitiveDict(dict):
     """Case-insensitive Dictionary for :class:`Response <models.Response>` Headers.
 
     For example, ``headers['content-encoding']`` will return the
     value of a ``'Content-Encoding'`` response header."""
 
-    def __init__(self, *args, **kwargs):
-        # super(CaseInsensitiveDict, self).__init__()
-        self.data = dict(*args, **kwargs)
-
-    def __repr__(self):
-        return self.data.__repr__()
-
-    def __getstate__(self):
-        return self.data.copy()
-
-    def __setstate__(self, d):
-        self.data = d
-
     def _lower_keys(self):
-        return map(str.lower, self.data.keys())
+        return map(str.lower, self.keys())
 
 
     def __contains__(self, key):
         return key.lower() in self._lower_keys()
 
 
     def __getitem__(self, key):
-
-        if key.lower() in self:
+        # We allow fall-through here, so values default to None
+        if key in self:
             return self.items()[self._lower_keys().index(key.lower())][1]
-
-
-    def __setitem__(self, key, value):
-        return self.data.__setitem__(key, value)
-
-
-    def __delitem__(self, key):
-        return self.data.__delitem__(key)
-
-
-    def __keys__(self):
-        return self.data.__keys__()
-
-
-    def __iter__(self):
-        return self.data.__iter__()
-
-
-    def iteritems(self):
-        return self.data.iteritems()