Next.js 16

• Async

  params

  /

  cookies

  /

  headers

  ; opt-in caching via

  "use cache"

  ; Turbopack default.

• ❌ Sync request APIs; ✅

  await

  params

  ,

  cookies()

  , and

  headers()

  .
• ❌ Keep

  middleware.ts

  ; ✅ use

  proxy.ts

  and

  export function proxy

  .
• ❌

  revalidateTag("posts")

  ; ✅

  revalidateTag("posts", "max")

  or

  { expire: ... }

  .

references/migration-checklist.md

references/cache-components.md

references/turbopack.md