Disable Gradio SSR on Spaces - the SSR frontend 404s under a custom launch

app.py

@@ -452,7 +452,17 @@ def serve_via_gradio() -> None:
     # leaves its initial server-rendered state. That looks exactly like "the
     # dashboard shows nothing" -- demo.load never fires, so the sign-in token in
     # the query string is never read.
-    launch_kwargs: dict = {"prevent_thread_lock": True, "show_api": False}
+    launch_kwargs: dict = {
+        "prevent_thread_lock": True,
+        "show_api": False,
+        # Spaces sets GRADIO_SSR_MODE=1, which switches the frontend to a
+        # Node-rendered SvelteKit build served from /_app/immutable/*. Launching
+        # ourselves never starts that SSR server, so every CSS/JS asset 404s,
+        # no JavaScript runs, and the page freezes on its server-rendered shell.
+        # Client-side rendering serves the assets straight out of the installed
+        # gradio package and needs no Node.
+        "ssr_mode": False,
+    }
     if port := os.environ.get("APP_PORT"):
         # Self-hosting / local dev, where nothing sets GRADIO_SERVER_PORT.
         launch_kwargs["server_name"] = "0.0.0.0"