Incremental Static Regeneration (ISR) with Next.js 15+

[joneslloyd]

Is this possible on Coolify? If no / sort of: What are the issues that prevent it from working?

From my tests, what seems to happen is that a page (eg, packages/web/src/app/(app)/[slug]/page.tsx) is generated on the first visit, but the cached version is served for every single request after that, even when using:

export const revalidate = 60;

Any information about this would be appreciated.

[djsisson]

@joneslloyd are you using cloudflare or some other provider, which can override cache control headers? check the browser network tab to see if its a cf cache hit

you can set this env 'NEXT_PRIVATE_DEBUG_CACHE=1'
this will log cache hits and misses etc

also make sure you aren't using an output of export as ISR is not supported in that mode.

please note coolify has nothing to do with what your nextjs app is serving, if you still have issues you are better off asking in nextjs discord/gh

[joneslloyd]

Thanks for getting back to me!

I'm using Hetzner actually.

I set NEXT_PRIVATE_DEBUG_CACHE=1, and got this when refreshing twice (before the 60 second revalidation period was up):

using filesystem cache handler
using memory store for fetch cache
using filesystem cache handler
pending revalidates promise finished for: { pathname: '/api/exit-preview', search: '?returnTo=%2Fcontact' }
using filesystem cache handler
using filesystem cache handler
pending revalidates promise finished for: { pathname: '/api/users/me', search: '' }
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
pending revalidates promise finished for: { pathname: '/api/users/me', search: '' }
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler

And this afterwards:

using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
pending revalidates promise finished for: { pathname: '/api/exit-preview', search: '?returnTo=%2Fcontact' }
using filesystem cache handler
pending revalidates promise finished for: { pathname: '/api/users/me', search: '' }
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler
using filesystem cache handler

also make sure you aren't using an output of export as ISR is not supported in that mode.

I'm using standalone.

please note coolify has nothing to do with what your nextjs app is serving

Fair point!