Connecting to Slash GraphQL using Dgraph4j

Here is a working snippet:

    ManagedChannel channel =
        ManagedChannelBuilder.forAddress("<your-name>.grpc.us-east-1.aws.thegaas.com", 443).useTransportSecurity().build();
    DgraphStub stub = DgraphGrpc.newStub(channel);

    Metadata metadata = new Metadata();
    metadata.put(
        Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER), "<api-key-here>");
    stub = MetadataUtils.attachHeaders(stub, metadata);

    return new DgraphClient(stub);