Random 500 errors on production server. Static app is still fetching data ?

[atissedrescaleway]

Summary

TL;DR : App is build statically with getStaticProps, still tries to fetch at request time, fails since API is protected under internal infra.

Our stack :

• We are using Next.js (v14.2.5) with pages router for our production website.
• We're self-hosting the app, on public serverless containers.
• All of the pages are exclusively built using getStaticProps.
• The build of the app is made in our CI, in our internal infra, and requests data for the pages to an API that's isn't accessible publicly.
• We use the output: standalone option

The issue :

Occasionally, we notice in the logs some 500 Internal Server Error. These logs says Error: Fetch failed...

--> Indeed, the fetch is logically failing because the public serverless container does not have access to the internal API where we have our data.

But why is the app is even fetching data in the first place, since none of our pages are using getServerSideProps?

--> That's the thing we don't understand. We're building the site statically so it doesn't need no fetch anything at request time.

Additional information

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Example

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