diff --git a/src/Denner/Client/DennerClient.php b/src/Denner/Client/DennerClient.php
index 48e1134..f9f8e41 100644
--- a/src/Denner/Client/DennerClient.php
+++ b/src/Denner/Client/DennerClient.php
@@ -19,12 +19,20 @@ abstract class DennerClient extends ServiceClient
 
     public static function factory($options = array())
     {
+//        $requiredOptions = array();
+//
+//        foreach ($requiredOptions as $optionName) {
+//            if (!isset($options[$optionName]) || $options[$optionName] === '') {
+//                throw new Exception\InvalidArgumentException(
+//                    sprintf('Missing required configuration option "%s"', $optionName)
+//                );
+//            }
+//        }
+
+        // These are applied if not otherwise specified
         $defaultOptions = array(
             'base_url' => self::getDefaultServiceUrl(),
             'defaults' => array(
-                // We're using our own error handler
-                // (this disabled the use of the internal HttpError subscriber)
-                'exceptions' => false,
                 // Float describing the number of seconds to wait while trying to connect to a server.
                 // 0 was the default (wait indefinitely).
                 'connect_timeout' => 10,
@@ -34,23 +42,6 @@ public static function factory($options = array())
             ),
         );
 
-        // If default options present, do a union with our $defaultOptions['defaults']
-        if (array_key_exists('defaults', $options)) {
-            $options['defaults'] += $defaultOptions['defaults'];
-        }
-
-//        $requiredOptions = array();
-//
-//        foreach ($requiredOptions as $optionName) {
-//            if (!isset($options[$optionName]) || $options[$optionName] === '') {
-//                throw new Exception\InvalidArgumentException(
-//                    sprintf('Missing required configuration option "%s"', $optionName)
-//                );
-//            }
-//        }
-
-        $config = Collection::fromConfig($options, $defaultOptions);
-
         $headers = array(
             'Accept' => 'application/json',
             'User-Agent' => 'denner-client/' . self::CLIENT_VERSION,
@@ -64,11 +55,20 @@ public static function factory($options = array())
             $headers['App-Key'] = $options['app_key'];
         }
 
-        $httpClient = new HttpClient($config->toArray());
-        $httpClient->setDefaultOption(
-            'headers',
-            array_merge($httpClient->getDefaultOption('headers') ?: array(), $headers)
+        // These are always applied
+        $overrideOptions = array(
+            'defaults' => array(
+                // We're using our own error handler
+                // (this disables the use of the internal HttpError subscriber)
+                'exceptions' => false,
+                'headers' => $headers,
+            ),
         );
+
+        // Apply options
+        $config = array_replace_recursive($defaultOptions, $options, $overrideOptions);
+
+        $httpClient = new HttpClient($config);
         $httpClient->getEmitter()->attach(new Subscriber\ErrorHandler());
 
         $serviceDescriptionFile = __DIR__ . sprintf('/ServiceDescription/%s.php', self::getServiceDescriptionName());