Fix Flask integration test compatibility with varying redirect URLs.
Replace hardcoded URL slicing with urlparse.urlsplit() to extract
the redirect path and query string. This avoids assumptions about
the redirect URL's scheme, hostname, and length.
Verify that the redirected request returns HTTP 302 Found.
--- ../tests/contrib/test_flask_util.py	2026-10-16 17:30:34.695350221 +0300
+++ ../tests/contrib/test_flask_util.py	2026-10-16 17:30:57.194612939 +0300
@@ -479,7 +479,12 @@
 
             # Starting the authorization flow should include the
             # include_granted_scopes parameter as well as the scopes.
-            response = client.get(response.headers['Location'][17:])
+            redirect_url = response.headers['Location']
+            parsed_url = urlparse.urlsplit(redirect_url)
+            response = client.get(
+                parsed_url.path + ('?' + parsed_url.query
+                                   if parsed_url.query else ''))
+            self.assertEqual(response.status_code, httplib.FOUND)
             q = urlparse.parse_qs(
                 response.headers['Location'].split('?', 1)[1])
             self.assertIn('include_granted_scopes', q)