diff --git a/appr/client.py b/appr/client.py
index 3b28655..874ee97 100644
--- a/appr/client.py
+++ b/appr/client.py
@@ -57,6 +57,8 @@ def _configure_endpoint(self, endpoint):
             else:
                 scheme = "https://"
             endpoint = scheme + endpoint
+        if 'URL_PREFIX' in os.environ:
+            return urlparse(endpoint + os.environ['URL_PREFIX'])
         return urlparse(endpoint + DEFAULT_PREFIX)
 
     @property