gistfile1.txt

private function addHttpClientSection(ArrayNodeDefinition $rootNode)
    {
        $subNode = $rootNode
            ->children()
                ->arrayNode('http_client')
                    ->info('HTTP Client configuration')
                    ->canBeEnabled()
                    ->fixXmlConfig('client')
                    ->children();

        $this->addHttpClientOptionsSection($subNode);

         $subNode = $subNode
                        ->arrayNode('clients')
                            ->useAttributeAsKey('name')
                            ->normalizeKeys(false)
                            ->arrayPrototype()
                                ->children();

        $this->addHttpClientOptionsSection($subNode);
        
        $subNode
                                ->end()
                            ->end()
                        ->end()
                    ->end()
                ->end()
            ->end()
        ;
    }