diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index ac23d03..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,5 +0,0 @@
-[submodule "frontend"]
-	path = frontend
-	url = https://github.com/opendatalab/labelU-frontend.git
-	branch = main
-	ignore = dirty
\ No newline at end of file
diff --git a/labelu/main.py b/labelu/main.py
index 4d460e4..518c7a4 100644
--- a/labelu/main.py
+++ b/labelu/main.py
@@ -103,9 +103,13 @@ def __init__(self, *args: Any, **kwargs: Any):
 
     def file_response(self, *args: Any, **kwargs: Any) -> Response:
         resp = super().file_response(*args, **kwargs)
-        resp.headers.setdefault("Cache-Control", self.cachecontrol)
-        resp.headers.setdefault("Pragma", self.pragma)
-        resp.headers.setdefault("Expires", self.expires)
+        
+        # No cache for html files
+        if resp.media_type == "text/html":
+            resp.headers.setdefault("Cache-Control", self.cachecontrol)
+            resp.headers.setdefault("Pragma", self.pragma)
+            resp.headers.setdefault("Expires", self.expires)
+            
         return resp
 
 app.mount("", NoCacheStaticFiles(packages=["labelu.internal"], html=True))