code: public void delete(String resourceGroupName, String cacheName, String ruleName) {
          deleteWithServiceResponseAsync(resourceGroupName, cacheName, ruleName).toBlocking().single().body();
      }
docs: Deletes a single firewall rule in a specified redis cache.
  
  @param resourceGroupName The name of the resource group.
  @param cacheName The name of the Redis cache.
  @param ruleName The name of the firewall rule.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent