Next.js: Partial Prerendering (PPR) — типичные gotcha на собеседовании

Question

Accepted Answer

PPR — один HTTP response, dynamic API вне Suspense отравляет route, fallback часть shell, experimental status — то, что ждут на интервью.

## Разбор

- **«How many HTTP requests?»** One. Dynamic holes stream в *same* response as shell — не client refetch. Second request = SWR pattern, не PPR.
- **Dynamic API outside Suspense opts entire route out.** Boundary contains dynamism; без него `cookies()` всё dynamic. Most common PPR mistake.
- **Fallback part of static shell.** Prerendered instantly — good skeleton = fast feel; bad fallback = layout shift при fill.
- **PPR not caching layer** — composes with four caches. Shell может ISR; holes obey Data Cache.
- **Experimental status.** PPR canary-only, per-route opt-in — signals you track release channel.

## Итог

Знайте: один request, Suspense обязателен вокруг dynamic, PPR experimental — три ответа, которые отличают понимание от buzzwords.