hal/elemento

i normally do this with domino-rest, i use a custom reader, e.g for pdf :

public class PDFReader implements ResponseReader<Blob> {
    @Override
    public Blob read(Response response) {
        JsResponse jsResponse = (JsResponse) response;
        Uint8Array buffer = new Uint8Array(jsResponse.getResponseArrayBuffer());
        BlobPropertyBag options = BlobPropertyBag.create();
        options.setType("application/pdf, application/octet-stream");
        return new Blob(new Blob.ConstructorBlobPartsArrayUnionType[]{
                Blob.ConstructorBlobPartsArrayUnionType.of(buffer)
        }, options);
    }
}

and the service is defined like this

    @Path("{uuid}/report/{type}")
    @GET
    @Produces(MediaType.APPLICATION_OCTET_STREAM)
    @Reader(PDFReader.class)
    Blob printReport(@PathParam("uuid") String uuid, @PathParam("type") String type);

and i call it using

ReportServiceFactory.INSTANCE
                .printReport(message.getUuid(), "PDF")
                .setResponseType("arraybuffer")
                .onSuccess(onEntriesLoaded::accept)
                .onFailed(failedResponseBean -> {
                    LOGGER.error("failed to download entries " + failedResponseBean);
                })
                .send();