diff --git a/rhodecode/lib/utils.py b/rhodecode/lib/utils.py
--- a/rhodecode/lib/utils.py
+++ b/rhodecode/lib/utils.py
@@ -21,6 +21,7 @@ Utilities library for RhodeCode
 """
 
 import datetime
+
 import decorator
 import logging
 import os
@@ -31,6 +32,7 @@ import socket
 import tempfile
 import traceback
 import tarfile
+import urllib.parse
 import warnings
 from functools import wraps
 from os.path import join as jn
@@ -849,7 +851,7 @@ def call_service_api(ini_path, payload):
         'auth_token': config.get('app:main', 'app.service_api.token')
     })
 
-    response = CurlSession().post(f'{host}{api_url}', json.dumps(payload))
+    response = CurlSession().post(urllib.parse.urljoin(host, api_url), json.dumps(payload))
 
     if response.status_code != 200:
         raise Exception("Service API responded with error")