code: public Observable<ValidateResponseInner> validateAsync(String resourceGroupName, ValidateRequest validateRequest) {
          return validateWithServiceResponseAsync(resourceGroupName, validateRequest).map(new Func1<ServiceResponse<ValidateResponseInner>, ValidateResponseInner>() {
              @Override
              public ValidateResponseInner call(ServiceResponse<ValidateResponseInner> response) {
                  return response.body();
              }
          });
      }
docs: Validate if a resource can be created.
  Validate if a resource can be created.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param validateRequest Request with the resources to validate.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ValidateResponseInner object