I am currently using the following public & open-source API

• http://www.geognos.com/api/en/countries/flag/IT.png

Here, this API is working in the localhost but after deploying it to the vercel, it is getting transferred from HTTP to HTTPS and showing undefined results.

What I had done?

I had found a solution which told to add

    <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">

in the /public/index.html.

But it still shows the following error

Is there a solution to tackle this problem? Please help me!