diff --git a/.travis.yml b/.travis.yml
index 7796bb8a..128885c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,5 +2,7 @@ language: python
 python:
   - "2.6"
   - "2.7"
+  - "3.3"
+  - "3.4"
 install: "pip install -r requirements.txt"
 script: py.test 
diff --git a/oauth2/__init__.py b/oauth2/__init__.py
index 36f5726c..6a5e6877 100644
--- a/oauth2/__init__.py
+++ b/oauth2/__init__.py
@@ -368,7 +368,8 @@ def url(self, value):
                 raise ValueError("Unsupported URL %s (%s)." % (value, scheme))
 
             # Normalized URL excludes params, query, and fragment.
-            self.normalized_url = urlparse.urlunsplit((scheme, netloc, path, None, None))
+            self.normalized_url = urlparse.urlunsplit((scheme.lower(),
+                netloc.lower(), path, None, None))
         else:
             self.normalized_url = None
             self.__dict__['url'] = None
diff --git a/tests/test_oauth.py b/tests/test_oauth.py
index bae3e514..2adcac04 100644
--- a/tests/test_oauth.py
+++ b/tests/test_oauth.py
@@ -224,7 +224,7 @@ def _compare_tokens(self, new):
         # TODO: What about copying the verifier to the new token?
         # self.assertEqual(self.token.verifier, new.verifier)
 
-    def test_to_string(self):
+    def test_to_string_magic_method(self):
         tok = oauth.Token('tooken', 'seecret')
         self.assertEqual(str(tok), 'oauth_token_secret=seecret&oauth_token=tooken')
 
@@ -303,6 +303,14 @@ def test_url(self):
         self.assertEquals(req.normalized_url, exp2)
         self.assertEquals(req.url, url2)
 
+    def test_url_lowercases_scheme_and_authority(self):
+        """Lowercase scheme and authority in URL normalization."""
+        # http://oauth.net/core/1.0a/#rfc.section.9.1.2
+        # https://github.com/joestump/python-oauth2/issues/29
+        url = 'HTTP://Example.com/resource'
+        req = oauth.Request("GET", url)
+        self.assertEquals(req.normalized_url, "http://example.com/resource")
+
     def test_bad_url(self):
         request = oauth.Request()
         try: