/// <summary>
 /// Update custom domain of one lifecycle application.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='resourceGroupName'>
 /// The name of the resource group that contains the resource. You can obtain
 /// this value from the Azure Resource Manager API or the portal.
 /// </param>
 /// <param name='serviceName'>
 /// The name of the Service resource.
 /// </param>
 /// <param name='appName'>
 /// The name of the App resource.
 /// </param>
 /// <param name='domainName'>
 /// The name of the custom domain resource.
 /// </param>
 /// <param name='domainResource'>
 /// Parameters for the create or update operation
 /// </param>
 /// <param name='cancellationToken'>
 /// The cancellation token.
 /// </param>
 public static async Task <CustomDomainResource> BeginUpdateAsync(this ICustomDomainsOperations operations, string resourceGroupName, string serviceName, string appName, string domainName, CustomDomainResource domainResource, CancellationToken cancellationToken = default(CancellationToken))
 {
     using (var _result = await operations.BeginUpdateWithHttpMessagesAsync(resourceGroupName, serviceName, appName, domainName, domainResource, null, cancellationToken).ConfigureAwait(false))
     {
         return(_result.Body);
     }
 }