diff --git a/src/client/app/common/views/components/url-preview.vue b/src/client/app/common/views/components/url-preview.vue
index e91e510550..fd25480f61 100644
--- a/src/client/app/common/views/components/url-preview.vue
+++ b/src/client/app/common/views/components/url-preview.vue
@@ -45,7 +45,7 @@ export default Vue.extend({
 		} else if (url.hostname == 'youtu.be') {
 			this.youtubeId = url.pathname;
 		} else {
-			fetch('/api:url?url=' + this.url).then(res => {
+			fetch('/url?url=' + this.url).then(res => {
 				res.json().then(info => {
 					this.title = info.title;
 					this.description = info.description;
diff --git a/src/client/docs/layout.pug b/src/client/docs/layout.pug
index 29d2a3ff69..1d9ebcb4cd 100644
--- a/src/client/docs/layout.pug
+++ b/src/client/docs/layout.pug
@@ -6,7 +6,7 @@ html(lang= lang)
 		meta(name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no")
 		title
 			| #{title} | Misskey Docs
-		link(rel="stylesheet" href="/assets/style.css")
+		link(rel="stylesheet" href="/docs/assets/style.css")
 		block meta
 
 		//- FontAwesome style
diff --git a/src/server/web/docs.ts b/src/server/web/docs.ts
index a546d1e88c..75da010682 100644
--- a/src/server/web/docs.ts
+++ b/src/server/web/docs.ts
@@ -2,20 +2,26 @@
  * Docs
  */
 
-import * as path from 'path';
+import ms = require('ms');
 import * as Router from 'koa-router';
 import * as send from 'koa-send';
 
-const docs = path.resolve(`${__dirname}/../../client/docs/`);
+const docs = `${__dirname}/../../client/docs/`;
 
 const router = new Router();
 
-router.get('/assets', async ctx => {
-	await send(ctx, `${docs}/assets`);
+router.get('/assets/*', async ctx => {
+	await send(ctx, ctx.path, {
+		root: docs,
+		maxage: ms('7 days'),
+		immutable: true
+	});
 });
 
-router.get(/^\/([a-z_\-\/]+?)$/, async ctx => {
-	await send(ctx, `${docs}/${ctx.params[0]}.html`);
+router.get('*', async ctx => {
+	await send(ctx, `${ctx.params[0]}.html`, {
+		root: docs
+	});
 });
 
-module.exports = router;
+export default router;
diff --git a/src/server/web/index.ts b/src/server/web/index.ts
index dd296f875d..376aadda73 100644
--- a/src/server/web/index.ts
+++ b/src/server/web/index.ts
@@ -8,6 +8,8 @@ import * as Router from 'koa-router';
 import * as send from 'koa-send';
 import * as favicon from 'koa-favicon';
 
+import docs from './docs';
+
 const client = `${__dirname}/../../client/`;
 
 // Init app
@@ -54,7 +56,7 @@ router.get('/manifest.json', async ctx => {
 //#endregion
 
 // Docs
-router.use('/docs', require('./docs').routes());
+router.use('/docs', docs.routes());
 
 // URL preview endpoint
 router.get('url', require('./url-preview'));