/r/ redirect endpoint: use HTTP 301, not 302

redirect.py

@@ -45,7 +45,7 @@ class RedirectHandler(common.Handler):
 
         # redirect
         logging.info('redirecting to %s', to)
-        self.redirect(to)
+        self.redirect(to, permanent=True)
 
     def convert_to_as2(self, url):
         """Fetch a URL as HTML, convert it to AS2, and return it.

tests/test_redirect.py

@@ -20,7 +20,7 @@ class RedirectTest(testutil.TestCase):
 
     def test_redirect(self):
         got = application.get_response('/r/https://foo.com/bar?baz=baj&biff')
-        self.assertEqual(302, got.status_int)
+        self.assertEqual(301, got.status_int)
         self.assertEqual('https://foo.com/bar?baz=baj&biff', got.headers['Location'])
 
     def test_redirect_scheme_missing(self):