code: public ServiceFuture<ApplicationGatewayBackendHealthInner> backendHealthAsync(String resourceGroupName, String applicationGatewayName, final ServiceCallback<ApplicationGatewayBackendHealthInner> serviceCallback) {
          return ServiceFuture.fromResponse(backendHealthWithServiceResponseAsync(resourceGroupName, applicationGatewayName), serviceCallback);
      }
docs: Gets the backend health of the specified application gateway in a resource group.
  
  @param resourceGroupName The name of the resource group.
  @param applicationGatewayName The name of the application gateway.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object