Collections.shuffle(servers);
        tryDownloadKeyFromServer(Fingerprint.wrap(fingerprint).toString(), servers, builder, keyring -> findMatchingKey(fingerprint, keyring, builder));
    }

    @SuppressWarnings("OptionalAssignedToNull")
    private void tryDownloadKeyFromServer(String fingerprint, List<URI> baseUris, PublicKeyResultBuilder builder, Consumer<? super PGPPublicKeyRing> onKeyring) {
        Deque<URI> serversLeft = new ArrayDeque<>(baseUris);