app-router-headers.ts

export const RSC = 'RSC' as const
export const ACTION = 'Next-Action' as const

export const NEXT_ROUTER_STATE_TREE = 'Next-Router-State-Tree' as const
export const NEXT_ROUTER_PREFETCH = 'Next-Router-Prefetch' as const
export const NEXT_URL = 'Next-Url' as const
export const RSC_CONTENT_TYPE_HEADER = 'text/x-component' as const
export const RSC_VARY_HEADER =
  `${RSC}, ${NEXT_ROUTER_STATE_TREE}, ${NEXT_ROUTER_PREFETCH}, ${NEXT_URL}` as const

export const FLIGHT_PARAMETERS = [
  [RSC],
  [NEXT_ROUTER_STATE_TREE],
  [NEXT_ROUTER_PREFETCH],
] as const

export const NEXT_RSC_UNION_QUERY = '_rsc' as const