code: public Observable<ServiceResponse<WorkflowTriggerCallbackUrlInner>> listContentCallbackUrlWithServiceResponseAsync(String resourceGroupName, String integrationAccountName, String schemaName, GetCallbackUrlParameters listContentCallbackUrl) {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (integrationAccountName == null) {
              throw new IllegalArgumentException("Parameter integrationAccountName is required and cannot be null.");
          }
          if (schemaName == null) {
              throw new IllegalArgumentException("Parameter schemaName is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          if (listContentCallbackUrl == null) {
              throw new IllegalArgumentException("Parameter listContentCallbackUrl is required and cannot be null.");
          }
          Validator.validate(listContentCallbackUrl);
          return service.listContentCallbackUrl(this.client.subscriptionId(), resourceGroupName, integrationAccountName, schemaName, this.client.apiVersion(), listContentCallbackUrl, this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<WorkflowTriggerCallbackUrlInner>>>() {
                  @Override
                  public Observable<ServiceResponse<WorkflowTriggerCallbackUrlInner>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<WorkflowTriggerCallbackUrlInner> clientResponse = listContentCallbackUrlDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get the content callback url.
  
  @param resourceGroupName The resource group name.
  @param integrationAccountName The integration account name.
  @param schemaName The integration account schema name.
  @param listContentCallbackUrl the GetCallbackUrlParameters value
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the WorkflowTriggerCallbackUrlInner object