[buffer] Fix Undefined offset: 504 notice

diff --git a/buffer/bufferapp.php b/buffer/bufferapp.php
index a222b23ec893766c4e857cead9fbf859650901c9..a9aeb49e78bd72463382e70cfbb60734240ac33d 100644 (file)
--- a/buffer/bufferapp.php
+++ b/buffer/bufferapp.php
@@ -45,6 +45,7 @@
                        '403' => 'Permission denied.',
                        '404' => 'Endpoint not found.',
                        '405' => 'Method not allowed.',
+                       '504' => 'Gateway timeout server response timeout.',
                        '1000' => 'An unknown error occurred.',
                        '1001' => 'Access token required.',
                        '1002' => 'Not within application scope.',