diff --git a/src/module/proxy/ai-proxy.ts b/src/module/proxy/ai-proxy.ts
index 3d8c00a..feab520 100644
--- a/src/module/proxy/ai-proxy.ts
+++ b/src/module/proxy/ai-proxy.ts
@@ -16,6 +16,7 @@ const getAiProxy = async (req: IncomingMessage, res: ServerResponse, opts: Proxy
   const pathname = _u.pathname;
   const params = _u.searchParams;
   const password = params.get('p');
+  const hash = params.get('hash');
   let objectName = '';
   let owner = '';
   const { user, app } = getUserFromRequest(req);
@@ -42,6 +43,11 @@ const getAiProxy = async (req: IncomingMessage, res: ServerResponse, opts: Proxy
     if (!checkPermission.success) {
       return createNotFoundPage('no permission');
     }
+    if (hash && stat.etag === hash) {
+      res.writeHead(304); // not modified
+      res.end('not modified')
+      return true;
+    }
     const filterMetaData = filterKeys(stat.metaData, ['size', 'etag', 'last-modified']);
     const contentLength = stat.size;
     const etag = stat.etag;