Next.js: Route handlers (API) — компромиссы и trade-offs

Route handlers — для external consumers; own app mutations — Server Actions; own page data — fetch in RSC.

Разбор

• Route handlers для external — webhooks, third-party, mobile, public REST/GraphQL. Full control status, headers, streaming.
• Own mutations — Server Actions. Не нужен hand-rolled POST + client fetch для form — меньше кода, progressive enhancement, type safety. Handlers когда client не ваш React app.
• Read data для own pages? Fetch в Server Component. Internal GET /api/x + fetch из server component — needless round-trip. Data source напрямую. Handlers на edges app, не между RSC и DB.

Итог

Handlers = app boundary; Server Actions = internal mutations; RSC fetch = internal reads.