diff --git a/src/cmsplugin_blurp/renderers/data_source.py b/src/cmsplugin_blurp/renderers/data_source.py
index b1059d2..5eb2f44 100644
--- a/src/cmsplugin_blurp/renderers/data_source.py
+++ b/src/cmsplugin_blurp/renderers/data_source.py
@@ -161,6 +161,7 @@ class Data(object):
             }
             if self.auth_mech == 'oauth2':
                 headers['Authorization'] = 'Bearer %s' % self.get_oauth2_access_token()
+            log.debug('with headers %r', headers)
             request = requests.get(
                     self.final_url,
                     headers=headers,