Add cache header to statics

index.ts

@@ -27,7 +27,12 @@ const { PUB_DIR = '.' } = process.env
 const server = http.createServer(async (req, res) => {
   // handle statics
   if (isStatic(req.url)) {
-    return serveHandler(req, res, { public: path.resolve(__dirname, PUB_DIR) })
+    return serveHandler(req, res, {
+      public: path.resolve(__dirname, PUB_DIR),
+      headers: [
+        { "source": "**/*", "headers": "public, max-age: 86400, s-maxage: 86400" }
+      ]
+    })
   }
 
   // handle `/docs/:name`