[pi0x]

Fixes #4408 on v2. Vercel only sends the query string to an ISR function when passQuery is set. With allowQuery alone, every ?lang= value got its own cache entry, but each one held the page rendered without lang. Nitro now writes passQuery: true to .prerender-config.json when the user's allowQuery lists any params, unless passQuery is set explicitly (false is respected). isr: true, routes without allowQuery and an empty allowQuery are unchanged. The JSDoc and Vercel docs are updated, and the same change is made on main in #4792.

I kept the ISR URL restoration changes backported from #4409 and #4599. On real Vercel they didn't change behavior for any request shape we saw, but they're small defensive handling and keep v2's runtime in line with main.

Checked on real Vercel against a v2 baseline. /products/a?lang=es lost lang before and keeps it now. ?lang=es and ?lang=fr are cached separately with the right content. Params not in allowQuery are dropped, __isr_route doesn't leak, and passQuery: false keeps the old behavior.

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Project	Deployment	Actions	Updated
nitro.build	Ready	Preview	Oct 15, 2026 9:16am UTC

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commit: 825abee

[pi0x]

Moving to draft. An e2e test on a real Vercel deployment showed no difference from v2: with allowQuery only (no passQuery), Vercel invokes the function at the -isr path with no query string and x-now-route-matches carries only the route, so ?lang=es can't be recovered at runtime. With passQuery: true the query already arrives and v2 handles it. The header-plus-query and missing-__isr_route shapes this PR handles never showed up, so the fix for #4408 likely needs a change to the generated route/prerender config instead (main's #4409 is probably affected the same way).

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