fix(cacheInterceptor): handle index route cache key

[gaauwe]

We noticed that our index page was not being served by the cache interceptor even though enableCacheInterception was enabled.

This is similar to #860, but the existing fix still uses ?? fallbacks. After trailing slash normalization, / becomes an empty string, so localizedPath ?? "/" still evaluates to "".

This normalizes the route path back to / for ISR detection, while keeping /index as the cache lookup key to match the generated cache asset.

Verified against a Cloudflare/OpenNext build:

• prerender manifest route key: /
• generated cache asset: index.cache
• populated cache key: /index

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🦋 Changeset detected

Latest commit: 8cc70bc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@opennextjs/aws	Patch
app-pages-router	Patch

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commit: 8cc70bc

[conico974]

Could you add some unit test ?

[conico974]

localizedPath is used in the rest of the files in a couple of places (i.e. hasBeenRevalidated, isStale).
Did you check if it has the right value there ?

[gaauwe]

Thanks for the review! It seems that I indeed missed the usage in hasBeenRevalidated and isStale, which should use the cacheKey.

I've added some tests to validate the behavior:

• /albums still uses /albums for the cache lookup and 'original-mode' cache checks, so existing non-index behavior is unchanged
• The new index cache key test fails without the route normalization, and now passes.
• The same index cache key test failed after my initial fix, because hasBeenRevalidated and isStale still received /
  • It now verifies that 'original-mode' tag cache checks use /index
• The new stale index route path test verifies that background revalidation still uses the public route /, not the cache key /index

As you can imagine this code is all new to me, so let me know if there is anything I can improve (:

[conico974]

LGTM, Thanks for the PR