Function handleResult

deps/undici/src/lib/interceptor/cache.js:263–396

* @param {DispatchFn} dispatch * @param {import('../../types/cache-interceptor.d.ts').default.CacheHandlerOptions} globalOpts * @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} cacheKey * @param {import('../../types/dispatcher.d.ts').default.DispatchHandler} handler * @para

(
  dispatch,
  globalOpts,
  cacheKey,
  handler,
  opts,
  reqCacheControl,
  result
)

 * @param {import('../../types/cache-interceptor.d.ts').default.GetResult | undefined} result
 */
function handleResult (
  dispatch,
  globalOpts,
  cacheKey,
  handler,
  opts,
  reqCacheControl,
  result
) {
  if (!result) {
    return handleUncachedResponse(dispatch, globalOpts, cacheKey, handler, opts, reqCacheControl)
  }

  const now = Date.now()
  if (now > result.deleteAt) {
    // Response is expired, cache store shouldn't have given this to us
    return dispatch(opts, new CacheHandler(globalOpts, cacheKey, handler))
  }

  const age = Math.round((now - result.cachedAt) / 1000)
  if (reqCacheControl?.['max-age'] && age >= reqCacheControl['max-age']) {
    // Response is considered expired for this specific request
    //  https://www.rfc-editor.org/rfc/rfc9111.html#section-5.2.1.1
    return dispatch(opts, handler)
  }

  const stale = isStale(result, reqCacheControl)
  const revalidate = needsRevalidation(result, reqCacheControl, opts)

  // Check if the response is stale
  if (stale || revalidate) {
    if (util.isStream(opts.body) && util.bodyLength(opts.body) !== 0) {
      // If body is a stream we can't revalidate...
      // TODO (fix): This could be less strict...
      return dispatch(opts, new CacheHandler(globalOpts, cacheKey, handler))
    }

    // RFC 5861: If we're within stale-while-revalidate window, serve stale immediately
    // and revalidate in background, unless immediate revalidation is necessary
    if (!revalidate && withinStaleWhileRevalidateWindow(result)) {
      // Serve stale response immediately
      sendCachedValue(handler, opts, result, age, null, true)

      // Start background revalidation (fire-and-forget)
      queueMicrotask(() => {
        const headers = {
          ...opts.headers,
          'if-modified-since': new Date(result.cachedAt).toUTCString()
        }

        if (result.etag) {
          headers['if-none-match'] = result.etag
        }

        if (result.vary) {
          for (const key in result.vary) {
            if (result.vary[key] != null) {
              headers[key] = result.vary[key]