diff --git a/nft_http_api_client/nftables_api_client/client.py b/nft_http_api_client/nftables_api_client/client.py
index 3df5e77..ab2d7d4 100644
--- a/nft_http_api_client/nftables_api_client/client.py
+++ b/nft_http_api_client/nftables_api_client/client.py
@@ -12,6 +12,10 @@ from os import getenv
 
 import urllib3
 
+default_retmap = {
+  'status': -1,
+  'data': {},
+}
 
 class NftablesRemote:
   def __init__(self, endpoint, token=None):
@@ -29,10 +33,7 @@ class NftablesRemote:
 
 
   def get(self, path):
-    retmap = {
-      'status': -1,
-      'data': {},
-    }
+    retmap = default_retmap.copy()
 
     response = urllib3.request(
       'GET',
@@ -44,3 +45,20 @@ class NftablesRemote:
     retmap['data'] = response.json()
 
     return retmap
+
+  def set_append(self, path, addresses):
+    retmap = default_retmap.copy()
+
+    response = urllib3.request(
+      'POST',
+      f'{self.endpoint}/{path}',
+      headers=self.auth_headers,
+      json={
+        'addresses': addresses,
+      },
+    )
+
+    retmap['status'] = response.status
+    retmap['data'] = response.json()
+
+    return retmap