diff --git a/optimizely/config_manager.py b/optimizely/config_manager.py
index 952b3d42..fdfc6459 100644
--- a/optimizely/config_manager.py
+++ b/optimizely/config_manager.py
@@ -404,7 +404,7 @@ def fetch_datafile(self) -> None:
 
             session.mount('http://', adapter)
             session.mount("https://", adapter)
-            response = session.get(self.datafile_url, timeout=enums.ConfigManager.REQUEST_TIMEOUT)
+            response = session.get(self.datafile_url, headers=request_headers, timeout=enums.ConfigManager.REQUEST_TIMEOUT)
         except requests_exceptions.RequestException as err:
             self.logger.error(f'Fetching datafile from {self.datafile_url} failed. Error: {err}')
             return
@@ -495,7 +495,7 @@ def fetch_datafile(self) -> None:
 
             session.mount('http://', adapter)
             session.mount("https://", adapter)
-            response = session.get(self.datafile_url, timeout=enums.ConfigManager.REQUEST_TIMEOUT)
+            response = session.get(self.datafile_url, headers=request_headers, timeout=enums.ConfigManager.REQUEST_TIMEOUT)
         except requests_exceptions.RequestException as err:
             self.logger.error(f'Fetching datafile from {self.datafile_url} failed. Error: {err}')
             return
diff --git a/tests/test_config_manager.py b/tests/test_config_manager.py
index 4877bb85..56674381 100644
--- a/tests/test_config_manager.py
+++ b/tests/test_config_manager.py
@@ -516,8 +516,9 @@ def test_fetch_datafile__exception_polling_thread_failed(self, _):
             # verify the error log message
             log_messages = [args[0] for args, _ in mock_logger.error.call_args_list]
             for message in log_messages:
+                print(message)
                 if "Thread for background datafile polling failed. " \
-                   "Error: timestamp too large to convert to C _PyTime_t" not in message:
+                   "Error: timestamp too large to convert to C PyTime_t" not in message:
                     assert False
 
     def test_is_running(self, _):
diff --git a/tests/test_event_dispatcher.py b/tests/test_event_dispatcher.py
index 37be623b..30311e35 100644
--- a/tests/test_event_dispatcher.py
+++ b/tests/test_event_dispatcher.py
@@ -46,7 +46,7 @@ def test_dispatch_event__post_request(self):
         }
         event = event_builder.Event(url, params, http_verb='POST', headers={'Content-Type': 'application/json'})
 
-        with mock.patch('requests.post') as mock_request_post:
+        with mock.patch('requests.Session.post') as mock_request_post:
             event_dispatcher.EventDispatcher.dispatch_event(event)
 
         mock_request_post.assert_called_once_with(
@@ -69,7 +69,7 @@ def test_dispatch_event__handle_request_exception(self):
         event = event_builder.Event(url, params, http_verb='POST', headers={'Content-Type': 'application/json'})
 
         with mock.patch(
-            'requests.post', side_effect=request_exception.RequestException('Failed Request'),
+            'requests.Session.post', side_effect=request_exception.RequestException('Failed Request'),
         ) as mock_request_post, mock.patch('logging.error') as mock_log_error:
             event_dispatcher.EventDispatcher.dispatch_event(event)