diff --git a/splitio/api/commons.py b/splitio/api/commons.py
index 92004cb8..0766ae49 100644
--- a/splitio/api/commons.py
+++ b/splitio/api/commons.py
@@ -57,7 +57,7 @@ def record_telemetry(status_code, elapsed, metric_name, telemetry_runtime_produc
 class FetchOptions(object):
     """Fetch Options object."""
 
-    def __init__(self, cache_control_headers=False, change_number=None):
+    def __init__(self, cache_control_headers=False, change_number=None, sets=None):
         """
         Class constructor.
 
@@ -66,9 +66,13 @@ def __init__(self, cache_control_headers=False, change_number=None):
 
         :param change_number: ChangeNumber to use for bypassing CDN in request.
         :type change_number: int
+
+        :param sets: list of flag sets
+        :type sets: list
         """
         self._cache_control_headers = cache_control_headers
         self._change_number = change_number
+        self._sets = sets
 
     @property
     def cache_control_headers(self):
@@ -80,12 +84,19 @@ def change_number(self):
         """Return change number."""
         return self._change_number
 
+    @property
+    def sets(self):
+        """Return sets."""
+        return self._sets
+
     def __eq__(self, other):
         """Match between other options."""
         if self._cache_control_headers != other._cache_control_headers:
             return False
         if self._change_number != other._change_number:
             return False
+        if self._sets != other._sets:
+            return False
         return True
 
 
@@ -113,4 +124,6 @@ def build_fetch(change_number, fetch_options, metadata):
         extra_headers[_CACHE_CONTROL] = _CACHE_CONTROL_NO_CACHE
     if fetch_options.change_number is not None:
         query['till'] = fetch_options.change_number
+    if fetch_options.sets is not None:
+        query['sets'] = fetch_options.sets
     return query, extra_headers
\ No newline at end of file
diff --git a/splitio/api/splits.py b/splitio/api/splits.py
index b584111b..78e15ef2 100644
--- a/splitio/api/splits.py
+++ b/splitio/api/splits.py
@@ -59,6 +59,8 @@ def fetch_splits(self, change_number, fetch_options):
             if 200 <= response.status_code < 300:
                 return json.loads(response.body)
             else:
+                if response.status_code == 414:
+                    _LOGGER.error('Error fetching feature flags; the amount of flag sets provided are too big, causing uri length error.')
                 raise APIException(response.body, response.status_code)
         except HttpClientException as exc:
             _LOGGER.error('Error fetching feature flags because an exception was raised by the HTTPClient')
diff --git a/tests/api/test_splits_api.py b/tests/api/test_splits_api.py
index 3c37b199..e8d1784e 100644
--- a/tests/api/test_splits_api.py
+++ b/tests/api/test_splits_api.py
@@ -19,7 +19,7 @@ def test_fetch_split_changes(self, mocker):
         httpclient.get.return_value = client.HttpResponse(200, '{"prop1": "value1"}')
         split_api = splits.SplitsAPI(httpclient, 'some_api_key', SdkMetadata('1.0', 'some', '1.2.3.4'), mocker.Mock())
 
-        response = split_api.fetch_splits(123, FetchOptions())
+        response = split_api.fetch_splits(123, FetchOptions(False, None, 'set1,set2'))
         assert response['prop1'] == 'value1'
         assert httpclient.get.mock_calls == [mocker.call('sdk', '/splitChanges', 'some_api_key',
                                                          extra_headers={
@@ -27,7 +27,7 @@ def test_fetch_split_changes(self, mocker):
                                                              'SplitSDKMachineIP': '1.2.3.4',
                                                              'SplitSDKMachineName': 'some'
                                                          },
-                                                         query={'since': 123})]
+                                                         query={'since': 123, 'sets': 'set1,set2'})]
 
         httpclient.reset_mock()
         response = split_api.fetch_splits(123, FetchOptions(True))
@@ -42,7 +42,7 @@ def test_fetch_split_changes(self, mocker):
                                                          query={'since': 123})]
 
         httpclient.reset_mock()
-        response = split_api.fetch_splits(123, FetchOptions(True, 123))
+        response = split_api.fetch_splits(123, FetchOptions(True, 123, 'set3'))
         assert response['prop1'] == 'value1'
         assert httpclient.get.mock_calls == [mocker.call('sdk', '/splitChanges', 'some_api_key',
                                                          extra_headers={
@@ -51,7 +51,7 @@ def test_fetch_split_changes(self, mocker):
                                                              'SplitSDKMachineName': 'some',
                                                              'Cache-Control': 'no-cache'
                                                          },
-                                                         query={'since': 123, 'till': 123})]
+                                                         query={'since': 123, 'till': 123, 'sets': 'set3'})]
 
         httpclient.reset_mock()
         def raise_exception(*args, **kwargs):