next.js/test/e2e/app-dir/trailingslash/app/api/revalidate/route.js

import { revalidatePath } from 'next/cache'
import { NextResponse } from 'next/server'

const isCacheComponentsEnabled = !!process.env.__NEXT_CACHE_COMPONENTS

export async function GET(request) {
  const lang = request.nextUrl.searchParams.get('lang') || 'en'
  const withSlash = request.nextUrl.searchParams.get('withSlash') !== 'false'

  // With rewrites, we need to revalidate the destination path (the actual
  // page), not the source path that users visit.
  let path = isCacheComponentsEnabled
    ? `/${lang}/cache-components`
    : `/${lang}/legacy`

  if (withSlash) {
    path += '/'
  }

  revalidatePath(path)

  return NextResponse.json({ timestamp: new Date().toISOString() })
}