CORS error on expressjs server hosted on aws elastic beanstalk

I have made simple expressJS server with nodemailer and have hosted it on aws elastic beanstalk, after which I was provided a 'http' link for the same, but I entered that link in my website which was hosted on netlify, it threw an error stating that an 'https' website cannot access 'http' website, so I converted my aws link to 'https' link, but after that I got an cors error from my netlify website.

I've tried multiple things, including importing the cors library from express like this:

const corsOptions = {
    origin: [
        /\.netlify\.app$/,
    ],
    methods: ['GET', 'POST']
}

app.use(cors(corsOptions));

or setting headers like:

app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next();
  });

but these methods did not work either, I always get the same error:access has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.` Please Help me resolve this error, I want to enable cors.

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