code: public Observable<WorkflowTriggerCallbackUrlInner> listContentCallbackUrlAsync(String resourceGroupName, String integrationAccountName, String assemblyArtifactName) {
          return listContentCallbackUrlWithServiceResponseAsync(resourceGroupName, integrationAccountName, assemblyArtifactName).map(new Func1<ServiceResponse<WorkflowTriggerCallbackUrlInner>, WorkflowTriggerCallbackUrlInner>() {
              @Override
              public WorkflowTriggerCallbackUrlInner call(ServiceResponse<WorkflowTriggerCallbackUrlInner> response) {
                  return response.body();
              }
          });
      }
docs: Get the content callback url for an integration account assembly.
  
  @param resourceGroupName The resource group name.
  @param integrationAccountName The integration account name.
  @param assemblyArtifactName The assembly artifact name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the WorkflowTriggerCallbackUrlInner object