diff --git a/configcatclient/rolloutevaluator.py b/configcatclient/rolloutevaluator.py
index f233f26..a1e9c34 100644
--- a/configcatclient/rolloutevaluator.py
+++ b/configcatclient/rolloutevaluator.py
@@ -188,9 +188,21 @@ def _get_user_attribute_value_as_string_list(self, attribute_value):
             attribute_value_list = json.loads(attribute_value)
         else:
             attribute_value_list = attribute_value
+
+        # Check if the result is a list
         if not isinstance(attribute_value_list, list):
             raise ValueError()
 
+        # Check if all items in the list are strings
+        for item in attribute_value_list:
+            # Handle unicode strings on Python 2.7
+            if sys.version_info[0] == 2:
+                if not isinstance(attribute_value, (str, unicode)):  # noqa: F821
+                    return attribute_value
+            else:
+                if not isinstance(item, str):
+                    raise ValueError()
+
         return attribute_value_list
 
     def _handle_invalid_user_attribute(self, comparison_attribute, comparator, comparison_value, key, validation_error):
diff --git a/configcatclienttests/test_evaluationlog.py b/configcatclienttests/test_evaluationlog.py
index 2a9c652..e22786b 100644
--- a/configcatclienttests/test_evaluationlog.py
+++ b/configcatclienttests/test_evaluationlog.py
@@ -26,52 +26,52 @@ def remove_unicode_prefix(string):
 
 class EvaluationLogTests(unittest.TestCase):
     def test_simple_value(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/simple_value.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/simple_value.json'))
 
     def test_1_targeting_rule(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/1_targeting_rule.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/1_targeting_rule.json'))
 
     def test_2_targeting_rules(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/2_targeting_rules.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/2_targeting_rules.json'))
 
     def test_options_based_on_user_id(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/options_based_on_user_id.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/options_based_on_user_id.json'))
 
     def test_options_based_on_custom_attr(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/options_based_on_custom_attr.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/options_based_on_custom_attr.json'))
 
     def test_options_after_targeting_rule(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/options_after_targeting_rule.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/options_after_targeting_rule.json'))
 
     def test_options_within_targeting_rule(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/options_within_targeting_rule.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/options_within_targeting_rule.json'))
 
     def test_and_rules(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/and_rules.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/and_rules.json'))
 
     def test_segment(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/segment.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/segment.json'))
 
     def test_prerequisite_flag(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/prerequisite_flag.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/prerequisite_flag.json'))
 
     def test_semver_validation(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/semver_validation.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/semver_validation.json'))
 
     def test_epoch_date_validation(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/epoch_date_validation.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/epoch_date_validation.json'))
 
     def test_number_validation(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/number_validation.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/number_validation.json'))
 
     def test_comparators_validation(self):
         self.maxDiff = None
-        self.assertTrue(self._evaluation_log('data/evaluation/comparators.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/comparators.json'))
 
     def test_list_truncation_validation(self):
-        self.assertTrue(self._evaluation_log('data/evaluation/list_truncation.json'))
+        self.assertTrue(self._test_evaluation_log('data/evaluation/list_truncation.json'))
 
-    def _evaluation_log(self, file_path, test_filter=None, generate_expected_log=False):
+    def _test_evaluation_log(self, file_path, test_filter=None, generate_expected_log=False):
         script_dir = os.path.dirname(__file__)
         file_path = os.path.join(script_dir, file_path)
         self.assertTrue(os.path.isfile(file_path))
diff --git a/configcatclienttests/test_integration_configcatclient.py b/configcatclienttests/test_integration_configcatclient.py
index 5bfcb75..70037fc 100644
--- a/configcatclienttests/test_integration_configcatclient.py
+++ b/configcatclienttests/test_integration_configcatclient.py
@@ -20,7 +20,7 @@
 except ImportError:
     from mock import Mock, ANY
 
-_SDK_KEY = 'PKDVCLf-Hq-h-kCzMp-L7Q/PaDVCFk9EpmD6sLpGLltTA'
+_SDK_KEY = 'configcat-sdk-1/PKDVCLf-Hq-h-kCzMp-L7Q/1cGEJXUwYUGZCBOL-E2sOw'
 
 
 class DefaultTests(unittest.TestCase):
diff --git a/configcatclienttests/test_lazyloadingcachepolicy.py b/configcatclienttests/test_lazyloadingcachepolicy.py
index e09f88c..f1c6b42 100644
--- a/configcatclienttests/test_lazyloadingcachepolicy.py
+++ b/configcatclienttests/test_lazyloadingcachepolicy.py
@@ -186,7 +186,6 @@ def test_cache_TTL_respects_external_cache(self):
             response_mock.json.return_value = json.loads(config_json_string_remote)
             response_mock.text = config_json_string_remote
             response_mock.status_code = 200
-            # response_mock.headers = {'ETag': 'etag'}
 
             config_json_string_local = TEST_JSON_FORMAT.format(value_type=SettingType.STRING, value='{"s": "test-local"}')
             config_cache = SingleValueConfigCache(ConfigEntry(
diff --git a/configcatclienttests/test_specialcharacter.py b/configcatclienttests/test_specialcharacter.py
new file mode 100644
index 0000000..4fe5ebe
--- /dev/null
+++ b/configcatclienttests/test_specialcharacter.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+import logging
+import unittest
+
+import configcatclient
+from configcatclient.user import User
+
+logging.basicConfig(level=logging.INFO)
+
+_SDK_KEY = 'configcat-sdk-1/PKDVCLf-Hq-h-kCzMp-L7Q/u28_1qNyZ0Wz-ldYHIU7-g'
+
+
+class SpecialCharacterTests(unittest.TestCase):
+    def setUp(self):
+        self.client = configcatclient.get(_SDK_KEY)
+
+    def tearDown(self):
+        self.client.close()
+
+    def test_special_characters_works_cleartext(self):
+        actual = self.client.get_value("specialCharacters", "NOT_CAT", User('äöüÄÖÜçéèñışğ⢙✓😀'))
+        self.assertEqual(actual, 'äöüÄÖÜçéèñışğ⢙✓😀')
+
+    def test_special_characters_works_hashed(self):
+        actual = self.client.get_value("specialCharactersHashed", "NOT_CAT", User('äöüÄÖÜçéèñışğ⢙✓😀'))
+        self.assertEqual(actual, 'äöüÄÖÜçéèñışğ⢙✓😀')
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/samples/consolesample/consolesample.py b/samples/consolesample/consolesample.py
index aaf38f7..275cc00 100644
--- a/samples/consolesample/consolesample.py
+++ b/samples/consolesample/consolesample.py
@@ -13,7 +13,7 @@
 
 if __name__ == '__main__':
     # Initialize the ConfigCatClient with an SDK Key.
-    client = configcatclient.get('PKDVCLf-Hq-h-kCzMp-L7Q/psuH7BGHoUmdONrzzUOY7A')
+    client = configcatclient.get('configcat-sdk-1/PKDVCLf-Hq-h-kCzMp-L7Q/AG6C1ngVb0CvM07un6JisQ')
 
     # In the project there is a 'keySampleText' setting with the following rules:
     # 1. If the User's country is Hungary, the value should be 'Dog'
@@ -38,7 +38,7 @@
     my_setting_value = client.get_value('keySampleText', 'default value', User('key'))
     print("'keySampleText' value from ConfigCat: " + str(my_setting_value))
 
-    # 4. As we don't pass an User object to this call, this will print the setting's default value - 'Cat'
+    # 4. As we don't pass a User object to this call, this will print the setting's default value - 'Cat'
     my_setting_value = client.get_value('keySampleText', 'default value')
     print("'keySampleText' value from ConfigCat: " + str(my_setting_value))
 
diff --git a/samples/consolesample/consolesample2.py b/samples/consolesample/consolesample2.py
index ee0baf8..c21c973 100644
--- a/samples/consolesample/consolesample2.py
+++ b/samples/consolesample/consolesample2.py
@@ -14,7 +14,7 @@
 if __name__ == '__main__':
     # Initialize the ConfigCatClient with an SDK Key.
     client = configcatclient.get(
-        'PKDVCLf-Hq-h-kCzMp-L7Q/HhOWfwVtZ0mb30i9wi17GQ')
+        'configcat-sdk-1/PKDVCLf-Hq-h-kCzMp-L7Q/tiOvFw5gkky9LFu1Duuvzw')
 
     # Creating a user object to identify your user (optional).
     userObject = User('Some UserID', email='configcat@example.com', custom={