code: public Observable<ServiceResponse<Domain>> getDomainWithServiceResponseAsync(UUID domainId) {
          if (domainId == null) {
              throw new IllegalArgumentException("Parameter domainId is required and cannot be null.");
          }
          if (this.client.apiKey() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiKey() is required and cannot be null.");
          }
          return service.getDomain(domainId, this.client.apiKey(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Domain>>>() {
                  @Override
                  public Observable<ServiceResponse<Domain>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<Domain> clientResponse = getDomainDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get information about a specific domain.
  
  @param domainId The id of the domain to get information about
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Domain object