def list_by_domain(resource_group_name, domain_name, custom_headers:nil)
      response = list_by_domain_async(resource_group_name, domain_name, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def list_by_domain(resource_group_name, domain_name, custom_headers:nil)
      response = list_by_domain_async(resource_group_name, domain_name, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
List domain topics.

 List all the topics in a domain.

 @param resource_group_name [String] The name of the resource group within the
 user's subscription.
 @param domain_name [String] Domain name.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [DomainTopicsListResult] operation results.