diff --git a/deploy/nginx/genarrative-preview-deployer-lan.conf b/deploy/nginx/genarrative-preview-deployer-lan.conf
index 82e698937..01cfb6817 100644
--- a/deploy/nginx/genarrative-preview-deployer-lan.conf
+++ b/deploy/nginx/genarrative-preview-deployer-lan.conf
@@ -3,7 +3,7 @@ location = /build {
 }
 
 location ^~ /build/ {
-    proxy_pass http://127.0.0.1:8410/;
+    proxy_pass http://127.0.0.1:8410;
     proxy_http_version 1.1;
 
     proxy_set_header Host $host;
diff --git a/scripts/check-preview-deployer.mjs b/scripts/check-preview-deployer.mjs
index 603956cb4..230052052 100644
--- a/scripts/check-preview-deployer.mjs
+++ b/scripts/check-preview-deployer.mjs
@@ -21,6 +21,10 @@ const systemd = readFileSync(
   'deploy/systemd/genarrative-preview-deployer.service',
   'utf8',
 );
+const server = readFileSync(
+  'server-rs/crates/preview-deployer-server/src/lib.rs',
+  'utf8',
+);
 const nginx = readFileSync(
   'deploy/nginx/genarrative-preview-deployer-lan.conf',
   'utf8',
@@ -118,6 +122,11 @@ assertIncludes(
   'location ^~ /build/',
   '内网 Nginx 必须提供 /build/ 路由。',
 );
+assertIncludes(
+  server,
+  '.nest_service("/build/assets", ServeDir::new(static_dir.join("assets")))',
+  '控制服务必须原生托管 /build 子路径，不能依赖 Nginx 隐式改写。',
+);
 assertIncludes(
   jobConfig,
   '<scriptPath>jenkins/Jenkinsfile.preview-deployer</scriptPath>',
diff --git a/server-rs/crates/preview-deployer-server/src/lib.rs b/server-rs/crates/preview-deployer-server/src/lib.rs
index 4915763ee..11e79db54 100644
--- a/server-rs/crates/preview-deployer-server/src/lib.rs
+++ b/server-rs/crates/preview-deployer-server/src/lib.rs
@@ -234,11 +234,16 @@ pub fn build_router(state: AppState) -> Router {
 
     let mut router = Router::new().merge(api);
     if let Some(static_dir) = state.config.static_dir.clone() {
-        router = router.fallback_service(
-            ServeDir::new(&static_dir)
-                .append_index_html_on_directories(true)
-                .fallback(ServeFile::new(static_dir.join("index.html"))),
-        );
+        let index = static_dir.join("index.html");
+        router = router
+            .route_service("/build", ServeFile::new(index.clone()))
+            .route_service("/build/", ServeFile::new(index.clone()))
+            .nest_service("/build/assets", ServeDir::new(static_dir.join("assets")))
+            .fallback_service(
+                ServeDir::new(&static_dir)
+                    .append_index_html_on_directories(true)
+                    .fallback(ServeFile::new(index)),
+            );
     }
 
     router