Prompt Title: Caching issues with Next.js and Nginx.

If __NEXT_DATA__ contains the same data even if the query parameters are different, it's possible that the caching issue is being caused by Next.js's internal data caching mechanism.

When you navigate between pages in a Next.js app, Next.js will attempt to prefetch and cache data for the next page in the background. This is done to improve the perceived performance of the app by reducing the amount of time it takes to load the next page.

If the data for the search page is being prefetched and cached by Next.js, it's possible that Next.js is reusing the cached data for subsequent requests, even if the query parameters are different. This could explain why __NEXT_DATA__ contains the same data even if the query parameters are different on the first load or coming from another page.

To disable Next.js's data caching, you can set the no-cache option in the fetch function in getInitialProps. This will prevent Next.js from caching the data and ensure that it always fetches fresh data from the server for each request. Here's an example:

javascriptCopy code
static async getInitialProps({ query, req, res }) {
  const data = await fetch(`https://example.com/api/search?q=${query.q}`, {
    headers: {
      'Cache-Control': 'no-cache',
    },
  }).then(res => res.json());

  return { data };
}

This configuration will ensure that Next.js always fetches fresh data from the server for each request, even if the query parameters are the same.