Refactor: Optimize static file caching for WebUI

- Renamed `NoCacheStaticFiles` to `SmartStaticFiles`.
- Implemented long-term caching (1 year, immutable) for versioned assets in `/webui/assets/`.
- Ensured `index.html` remains un-cached.
- Set correct `Content-Type` for JS and CSS files.

lightrag/api/lightrag_server.py

@@ -478,18 +478,25 @@ def create_app(args):
             logger.error(f"Error getting health status: {str(e)}")
             raise HTTPException(status_code=500, detail=str(e))
 
-    # Custom StaticFiles class to prevent caching of HTML files
+    # Custom StaticFiles class for smart caching
-    class NoCacheStaticFiles(StaticFiles):
+    class SmartStaticFiles(StaticFiles): # Renamed from NoCacheStaticFiles
         async def get_response(self, path: str, scope):
             response = await super().get_response(path, scope)
+            
             if path.endswith(".html"):
-                response.headers["Cache-Control"] = (
+                response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
-                    "no-cache, no-store, must-revalidate"
-                )
                 response.headers["Pragma"] = "no-cache"
                 response.headers["Expires"] = "0"
-            elif path.endswith(".js"):
+            elif "/assets/" in path: # Assets (JS, CSS, images, fonts) generated by Vite with hash in filename
+                response.headers["Cache-Control"] = "public, max-age=31536000, immutable"
+            # Add other rules here if needed for non-HTML, non-asset files
+            
+            # Ensure correct Content-Type
+            if path.endswith(".js"):
                 response.headers["Content-Type"] = "application/javascript"
+            elif path.endswith(".css"):
+                response.headers["Content-Type"] = "text/css"
+                
             return response
 
     # Webui mount webui/index.html
@@ -497,7 +504,7 @@ def create_app(args):
     static_dir.mkdir(exist_ok=True)
     app.mount(
         "/webui",
-        NoCacheStaticFiles(directory=static_dir, html=True, check_dir=True),
+        SmartStaticFiles(directory=static_dir, html=True, check_dir=True), # Use SmartStaticFiles
         name="webui",
     )