1const servingCacheH: Record<string, {serving: boolean, ts: number}> = {}
2const servingCacheTtlMs = 60_000
3const probeTimeoutMs = 3_000
4
5export const isRegcacheServing = async (cacheHost: string): Promise<boolean> => {
6  const cached = servingCacheH[cacheHost]
7  if (cached && Date.now() - cached.ts < servingCacheTtlMs) return cached.serving
8  let serving = false
9  try {
10    const resp = await fetch(`https://${cacheHost}/v2/`, {signal: AbortSignal.timeout(probeTimeoutMs)})
11    serving = resp.status === 200 || resp.status === 401
12  } catch {} // catch:userapproved — probe failure means not serving
13  servingCacheH[cacheHost] = {serving, ts: Date.now()}
14  return serving
15}
16