diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 88e93ba6b002eb..a8501ab863968f 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -218,6 +218,7 @@ The following classes are provided:
    (X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11"``, while
    :mod:`urllib`'s default user agent string is
    ``"Python-urllib/2.6"`` (on Python 2.6).
+   All header keys are sent in camel case.
 
    An appropriate ``Content-Type`` header should be included if the *data*
    argument is present.  If this header has not been provided and *data*
diff --git a/Lib/test/test_urllib2_localnet.py b/Lib/test/test_urllib2_localnet.py
index 36314312ac0eba..f4729358557c95 100644
--- a/Lib/test/test_urllib2_localnet.py
+++ b/Lib/test/test_urllib2_localnet.py
@@ -617,6 +617,15 @@ def test_sending_headers(self):
             pass
         self.assertEqual(handler.headers_received["Range"], "bytes=20-39")
 
+    def test_sending_headers_camel(self):
+        handler = self.start_server()
+        req = urllib.request.Request("http://localhost:%s/" % handler.port,
+                                     headers={"X-SoMe-hEader": "foobar"})
+        with urllib.request.urlopen(req):
+            pass
+        self.assertIn("X-Some-Header", handler.headers_received.keys())
+        self.assertNotIn("X-SoMe-hEader", handler.headers_received.keys())
+
     def test_basic(self):
         handler = self.start_server()
         with urllib.request.urlopen("http://localhost:%s" % handler.port) as open_url: