CORs whitelist not applying in App Platform (Nodejs server)?

I have an Apollo GraphQL server w/ Express as the middleware. I have enabled cors as specified in the docs:

const app = express();
app.use(cors({ origin: "*" }));

const server = new ApolloServer({
 ...
});

server.applyMiddleware({
  app,
  path: "/graphql",
});

const httpServer = http.createServer(app);
server.installSubscriptionHandlers(httpServer);

After the app successfully launches, I verify that I can indeed navigate to the GraphQL playground at /graphql and execute a query.

However, when I try to perform requests from my React Native app, I get a CORS error:

Access to fetch at 'http://xxx.ondigitalocean.app:8080/graphql' from origin 'http://localhost:19006' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

I have added both of the following to the CORS policy: http://localhost Prefix http://localhost:19006 Exact