NextJs rewrites does not proxy API calls in getServerSideProps

I am using react-query prefetchQuery and NextJS (v.13) getServerSideProps along with its rewrites option in next.config.js file to proxy API calls.

The rewrites looks like this:

async rewrites() {
  return [
    {
      source: "/api/:slug*",
      destination: "http://test.example.com/api/:slug*",
    },
  ];
},

The problem is, this proxying does not work in getServerSideProps. The API response is 404 not Found.

Here is what I am doing in getServerSideProps:

const queryClient = new QueryClient();

await Promise.all([queryClient.prefetchQuery(["getData"], async () => await getData())]);

where the EndPoint being called in getData is /api/get_page_data. But everything works fine when I change the EndPoint to an absolute URL, like http://test.example.com/api/get_page_data.

P.S.: I am using Axios for calling APIs, in case this info is helpful.