diff --git a/manual/repo/docker/thumbnail-server.yml b/manual/repo/docker/thumbnail-server.yml
index 30875904..d1192fe0 100644
--- a/manual/repo/docker/thumbnail-server.yml
+++ b/manual/repo/docker/thumbnail-server.yml
@@ -33,9 +33,11 @@ services:
       - S3_SSE_C_KEY=${S3_SSE_C_KEY:-}
     labels:
       caddy: ${SEAFILE_SERVER_PROTOCOL:-http}://${SEAFILE_SERVER_HOSTNAME:?Variable is not set or empty}
-      caddy.1_handle_path: "/thumbnail*"
-      caddy.1_handle_path.0_rewrite: "* {uri}"
-      caddy.1_handle_path.1_reverse_proxy: "{{upstreams 80}}"
+      caddy.1_handle: "/thumbnail/*"
+      caddy.1_handle.0_reverse_proxy: "{{upstreams 80}}"
+      caddy.2_handle_path: "/thumbnail/ping"
+      caddy.2_handle_path.0_rewrite: "/ping"
+      caddy.2_handle_path.1_reverse_proxy: "{{upstreams 80}}"
     depends_on:
       db:
         condition: service_healthy