Hcaptcha CORS error even after adding domain to hosts file. (WINDOWS)

Question

As per the hcaptcha docs it says:

I have done this, but I still get a CORS error in my requests. I am visiting the URL from: http://test.mydomain.com:3000 and in my network requests it comes from the same URL.

My hosts file contains: 127.0.0.1 test.mydomain.com

I'm not sure what else to try.

  const handleVerificationSuccess = async (token, ekey) => {
    console.log(token);

    // Provide your secret key here
    const secretKey = '...';

    const response = await fetch('https://hcaptcha.com/siteverify', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      body: `response=${token}&secret=${secretKey}`, // make sure to URL encode the data
    });

    const data = await response.json();
  };