if accessKeyID == "" || secretAccessKey == "" {
		return errors.New("Presign cannot be generated without access and secret keys")
	}

	// FIXME: Remove following portion of code after fixing a bug in minio-go preSignV2.

	d := UTCNow()
	// Find epoch expires when the request will expire.
	epochExpires := d.Unix() + expires

	// Add expires header if not present.

    Collection<String> collection = map.values();

    LenientSerializableTester.reserializeAndAssertElementsEqual(collection);
  }

  // TODO: Re-enable this test after moving to new serialization format in ImmutableMap.
  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  @SuppressWarnings("unchecked")

		{"volatile-bucket-3", "", "", "", 1000, ListObjectsInfo{}, BucketNotFound{Bucket: "volatile-bucket-3"}, false},
		// If marker is *after* the last possible object from the prefix it should return an empty list.
		{"test-bucket-list-object", "Asia", "europe-object", "", 0, ListObjectsInfo{}, nil, true},

   * elements are in the first {@code k} positions of {@code contents}, and {@code contents[i] ==
   * null} for {@code k <= i < n}.
   *
   * <p>This method takes ownership of {@code contents}; do not modify {@code contents} after this
   * returns.
   *
   * @throws NullPointerException if any of the first {@code n} elements of {@code contents} is null
   */
  static <E> ImmutableSortedSet<E> construct(

    // bytes when the both the map and its keySet or value collection are written to the same
    // instance of ObjectOutputStream.

    // TODO(b/160980469): remove support for the old serialization format after some time
    private static final boolean USE_LEGACY_SERIALIZATION = true;

    private final Object keys;
    private final Object values;

    SerializedForm(ImmutableMap<K, V> map) {

    return fromEntries(comparator, sameComparator, entryArray, entryArray.length);
  }

  @SuppressWarnings("nullness") // TODO: b/316358623 - Remove after checker fix.
  private static <K, V> ImmutableSortedMap<K, V> fromEntries(
      final Comparator<? super K> comparator,
      boolean sameComparator,
      @Nullable Entry<K, V>[] entryArray,
      int size) {

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrParseMissingIdentAfterAt: {
		Code:           "ParseMissingIdentAfterAt",
		Description:    "Did not find the expected identifier after the @ symbol in the SQL expression.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrParseUnexpectedOperator: {
		Code:           "ParseUnexpectedOperator",

	type healResp struct {
		respBytes []byte
		apiErr    APIError
		errBody   string
	}

	// Define a closure to start sending whitespace to client
	// after 10s unless a response item comes in
	keepConnLive := func(w http.ResponseWriter, r *http.Request, respCh chan healResp) {
		ticker := time.NewTicker(time.Second * 10)
		defer ticker.Stop()
		started := false