def get_by_id(appliance_definition_id, custom_headers:nil)
      response = get_by_id_async(appliance_definition_id, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def get_by_id(appliance_definition_id, custom_headers:nil)
      response = get_by_id_async(appliance_definition_id, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
Gets the appliance definition.

 @param appliance_definition_id [String] The fully qualified ID of the
 appliance definition, including the appliance name and the appliance
 definition resource type. Use the format,
 /subscriptions/{guid}/resourceGroups/{resource-group-name}/Microsoft.Solutions/applianceDefinitions/{applianceDefinition-name}
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [ApplianceDefinition] operation results.