i have deployed a nodejs express server to heroku, and when i try to use it i get back the error -
"Access to XMLHttpRequest at 'https://harel-shop-backend.herokuapp.com/auth/autologin' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status."
in the browser.

this is my app.ts code -

import './db/mongoose';
import HttpError from './model/http-error';
import cors from 'cors';

import authRoutes from './routes/auth.router';
import productRouter from './routes/product.router';

const app = express();
app.use(cors());

app.use(express.json());
app.use(express.urlencoded({ extended: false }));

app.use((req, res, next) => {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept, Authorization ,AuthorizationRefresh ,user'
  );
  res.setHeader(
    'Access-Control-Allow-Methods',
    'OPTIONS, GET, POST, PATCH, DELETE'
  );

  next();
});


app.use('/auth', authRoutes);
app.use('/products', productRouter);

app.use((req, res, next) => {
  throw new HttpError('couldnt find this route', 404);
});

app.use((error: any, req: Request, res: Response, next: NextFunction) => {
  if (res.headersSent) {
    return next(error);
  }
  res.status(error.code || 500);
  res.json({ message: error.message || 'an unknown error occurred' });
});


app.listen(3030, () => {
  console.log('server is running');
});

i have tried to install extensions to my browser to disable cors but didnt work ,
i tried to add the ('Access-Control-Allow-Origin', '*') but also didnt work.
installed the cors package and used in the line 10 , also didnt work

CodePudding user response：

So i fixed the problem and i did 2 things ,

1. Made a dist folder with npm build and added a Procfile and wrote there - web: node dist/app.js
2. I also added process.env.PORT || 3030 to the app.listen function