if err != nil {
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
	}
	stale := r.Form.Get("stale") == "true" // list also stale locks

	peerLocks := globalNotificationSys.GetLocks(ctx, r)

	topLocks := topLockEntries(peerLocks, stale)

	// Marshal API response upto requested count.
	if len(topLocks) > count && count > 0 {
		topLocks = topLocks[:count]
	}

                final long deletedDocCount = deleteOldDocuments(searchEngineClient, docList);
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleted {} stale documents", deletedDocCount);
                }
                final BulkResponse response =
                        searchEngineClient.addAll(fessConfig.getIndexDocumentUpdateIndex(), docList, (doc, builder) -> {

  // TODO GET preferred order - with tests to confirm this
  // 1. successful fresh cached GET response
  // 2. unsuccessful (404, 500) fresh cached GET response
  // 3. successful network response
  // 4. successful stale cached GET response
  // 5. unsuccessful response
  @Test
  fun usesCache() {
    val cache = Cache(cacheFs, "cache".toPath(), (100 * 1024).toLong())

        .header("Cache-Control", "max-stale=180")
        .build()
    val response = client.newCall(request).execute()
    assertThat(response.body.string()).isEqualTo("A")
    assertThat(response.header("Warning")).isEqualTo(
      "110 HttpURLConnection \"Response is stale\"",
    )
  }

  @Test
  fun requestMaxStaleDirectiveWithNoValue() {
    // Add a stale response to the cache.
    server.enqueue(

   * implementation; otherwise refreshes will be performed during unrelated cache read and write
   * operations.
   *
   * <p>Currently automatic refreshes are performed when the first stale request for an entry
   * occurs. The request triggering refresh will make a synchronous call to {@link
   * CacheLoader#reload}
   * to obtain a future of the new value. If the returned future is already complete, it is returned

_2020-04-06_

**This release fixes a severe bug where OkHttp incorrectly detected and recovered from unhealthy
connections.** Stale or canceled connections were incorrectly attempted when they shouldn't have
been, leading to rare cases of infinite retries. Please upgrade to this release!

 *  Fix: don't return stale DNS entries in `DnsOverHttps`. We were caching DNS results indefinitely

		// value is cached we should attempt to invalidate it if such calls
		// were attempted. This can lead to false success under certain conditions
		// - this change attempts to avoid stale information if the underlying
		// transport is already down.
		return "", errDiskNotFound
	}

	// This call should never be over the network, this is always
	// a cached value - caller should make sure to use this

   * count, and a blank line.
   *
   * Each of the subsequent lines in the file is a record of the state of a cache entry. Each line
   * contains space-separated values: a state, a key, and optional state-specific values.
   *
   *   o DIRTY lines track that an entry is actively being created or updated. Every successful

          },
        ).build()
    dns["san.com"] = Dns.SYSTEM.lookup(server.hostName).subList(0, 1)
    assert200Http2Response(execute(url), server.hostName)

    // Simulate a stale connection in the pool.
    connection.get()!!.socket().close()
    val sanUrl = url.newBuilder().host("san.com").build()
    assert200Http2Response(execute(sanUrl), "san.com")

  double storedPermits;

  /** The maximum number of stored permits. */
  double maxPermits;

  /**
   * The interval between two unit requests, at our stable rate. E.g., a stable rate of 5 permits
   * per second has a stable interval of 200ms.
   */
  double stableIntervalMicros;

  /**
   * The time when the next request (no matter its size) will be granted. After granting a request,