diff --git a/Server/Live2dBackend.cpp b/Server/Live2dBackend.cpp
index bdbc37b..3304a2d 100644
--- a/Server/Live2dBackend.cpp
+++ b/Server/Live2dBackend.cpp
@@ -40,6 +40,8 @@ Live2dBackend::Live2dBackend() {
         res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
         res.set(http::field::content_type, ResponseUtility::mimeType(path));
         // res.set(http::field::access_control_allow_origin, "*");
+        res.set(http::field::cache_control, "max-age=2592000");
+        res.set(http::field::expires, "Fri, 22 Nov 2124 13:30:28 GMT");
         res.content_length(size);
         res.keep_alive(request.keep_alive());
         session.reply(std::move(res));