After using getServerSideProps, when the server is redeployed, json and their responses are empty {}. about next.js HOT 3 OPEN

I have the same issue but on getStaticProps. It happens when you keep a page open and do a rebuild, and right after the rebuild you go to the page again, and click any internal links then you'll see their responses are empty.

So I checked an older Nextjs version(13.4.8) to see how it was working before.

Before, when you click any internal links after a rebuild, the JSON files will return 404 then sends you to the actual page.

Now using the latest version(14.1.0), when you click any internal links after a rebuild, the JSON files will return 200 but wont send you to the actual page.

It's probably a caching issue, the page doesn't seem to realize that the JSON URL doesn't exist anymore.

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I believe it's a cache issue.
Next base server returns res.body("{}").send(); when there no content change.
Just to confirm, after you get that empty object, open the json link in a new tab and force page reload, do you see the content again ? If so, you need to force a res.setHeader('Cache-Control', 'no-store');

Another question, are you using any service workers ? pwa stuff ?

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It's an issue if you are using the middleware with the pages directory. More can be found here: #57207, #59612. It was fixed in v14.1.1-canary.37, but was not included in the v14.1.1 release 🤷‍♂️

The latest stable release that does not have this issue is v13.4.12

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