modify checkbox text in notes

server/run.sh

@@ -38,6 +38,16 @@ esac
 PORT="${PORT:-$DEFAULT_PORT}"
 HOST="${HOST:-$DEFAULT_HOST}"
 
+# Prevent the main app from proxying to itself. Without an explicit
+# SENSORS_API_URL the client targets localhost:8001, so main must not listen
+# there as well.
+if [ "$APP" = "main" ] && [ -z "${SENSORS_API_URL:-}" ] && [ "$PORT" = "8001" ]; then
+    echo "Refusing to start main on port 8001: SENSORS_API_URL would default to" >&2
+    echo "http://localhost:8001 and the app would call itself recursively." >&2
+    echo "Use another port (for example 8000) or set SENSORS_API_URL explicitly." >&2
+    exit 2
+fi
+
 if [ -x ".venv/bin/python" ]; then
     PYTHON=".venv/bin/python"
 else