return nonNull;
  }

  /**
   * Creates a {@link FutureCombiner} that processes the completed futures whether or not they're
   * successful.
   *
   * <p>Any failures from the input futures will not be propagated to the returned future.
   *
   * @since 20.0
   */
  @SafeVarargs
  public static <V extends @Nullable Object> FutureCombiner<V> whenAllComplete(
      ListenableFuture<? extends V>... futures) {

   * operation at some <i>undefined</i> point in the future.
   *
   * <p><b>Warning:</b> any exception thrown by {@code listener} will <i>not</i> be propagated to
   * the {@code Cache} user, only logged via a {@link Logger}.
   *
   * @return the cache builder reference that should be used instead of {@code this} for any
   *     remaining configuration and cache building

   * operation at some <i>undefined</i> point in the future.
   *
   * <p><b>Warning:</b> any exception thrown by {@code listener} will <i>not</i> be propagated to
   * the {@code Cache} user, only logged via a {@link Logger}.
   *
   * @return the cache builder reference that should be used instead of {@code this} for any
   *     remaining configuration and cache building

    val call1 = localClient.newCall(Request(server.url("/")))
    val response1 = call1.execute()
    assertThat(response1.body.string()).isEqualTo("ABC")

    // Add delays for DISCONNECT_AT_END to propogate
    waitForConnectionShutdown(connections[0])
    val call2 = localClient.newCall(Request(server.url("/")))
    val response2 = call2.execute()
    assertThat(response2.body.string()).isEqualTo("DEF")