diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index 02b779d741..7206653a44 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -228,6 +228,8 @@ export class ClientServerService {
 				return;
 			}
 
+			reply.header('Cache-Control', 'public, max-age=3600');
+
 			const name = path.split('@')[0].replace('.webp', '');
 			const host = path.split('@')[1]?.replace('.webp', '');
 
@@ -244,7 +246,7 @@ export class ClientServerService {
 
 			reply.header('Content-Security-Policy', 'default-src \'none\'; style-src \'unsafe-inline\'');
 
-			const url = new URL("/proxy/emoji.webp", this.config.url);
+			const url = new URL('/proxy/emoji.webp', this.config.url);
 			// || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
 			url.searchParams.set('url', emoji.publicUrl || emoji.originalUrl);
 			url.searchParams.set('emoji', '1');
@@ -347,15 +349,15 @@ export class ClientServerService {
 		fastify.get('/opensearch.xml', async (request, reply) => {
 			const meta = await this.metaService.fetch();
 
-			const name = meta.name || "Misskey";
-			let content = "";
-			content += `<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">`;
+			const name = meta.name || 'Misskey';
+			let content = '';
+			content += '<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">';
 			content += `<ShortName>${name} Search</ShortName>`;
 			content += `<Description>${name} Search</Description>`;
-			content += `<InputEncoding>UTF-8</InputEncoding>`;
+			content += '<InputEncoding>UTF-8</InputEncoding>';
 			content += `<Image width="16" height="16" type="image/x-icon">${this.config.url}/favicon.ico</Image>`;
 			content += `<Url type="text/html" template="${this.config.url}/search?q={searchTerms}"/>`;
-			content += `</OpenSearchDescription>`;
+			content += '</OpenSearchDescription>';
 
 			reply.header('Content-Type', 'application/opensearchdescription+xml');
 			return await reply.send(content);