update

backend/src/main.rs

@@ -49,7 +49,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .route("/api/tiles/:z/:x/:y/landuse", get(get_tile_landuse))
         .route("/api/tiles/:z/:x/:y/water", get(get_tile_water))
         .route("/api/tiles/:z/:x/:y/railways", get(get_tile_railways))
-        .nest_service("/", ServeDir::new("static"))
+        .nest_service("/", ServeDir::new("static").append_index_html_on_directories(true))
         .layer(CorsLayer::permissive())
         .with_state(state);