code: public ImageRegionProposal getImageRegionProposals(UUID projectId, UUID imageId) {
          return getImageRegionProposalsWithServiceResponseAsync(projectId, imageId).toBlocking().single().body();
      }
docs: Get region proposals for an image. Returns empty array if no proposals are found.
  This API will get region proposals for an image along with confidences for the region. It returns an empty array if no proposals are found.
  
  @param projectId The project id
  @param imageId The image id
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ImageRegionProposal object if successful.