diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 3c943c3..ec4e49a 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -57,14 +57,18 @@ class Configuration implements ConfigurationInterface
                         ->arrayNode('request_format')
                             ->addDefaultsIfNotSet()
                             ->children()
+                                ->arrayNode('formats')
+                                    ->defaultValue(array(
+                                        'json' => 'application/json',
+                                        'xml' => 'application/xml'
+                                    ))
+                                    ->prototype('scalar')->end()
+                                ->end()
                                 ->enumNode('method')
                                     ->values(array('format_param', 'accept_header'))
                                     ->defaultValue('format_param')
                                 ->end()
-                                ->enumNode('default_format')
-                                    ->values(array('json', 'xml'))
-                                    ->defaultValue('json')
-                                ->end()
+                                ->scalarNode('default_format')->defaultValue('json')->end()
                             ->end()
                         ->end()
                         ->arrayNode('authentication')
diff --git a/DependencyInjection/NelmioApiDocExtension.php b/DependencyInjection/NelmioApiDocExtension.php
index 3406f25..a56eacd 100644
--- a/DependencyInjection/NelmioApiDocExtension.php
+++ b/DependencyInjection/NelmioApiDocExtension.php
@@ -37,6 +37,7 @@ class NelmioApiDocExtension extends Extension
         $container->setParameter('nelmio_api_doc.sandbox.accept_type', $config['sandbox']['accept_type']);
         $container->setParameter('nelmio_api_doc.sandbox.body_format', $config['sandbox']['body_format']);
         $container->setParameter('nelmio_api_doc.sandbox.request_format.default_format', $config['sandbox']['request_format']['default_format']);
+        $container->setParameter('nelmio_api_doc.sandbox.request_format.formats', $config['sandbox']['request_format']['formats']);
 
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('formatters.xml');
diff --git a/Formatter/HtmlFormatter.php b/Formatter/HtmlFormatter.php
index 750f82c..0f026cf 100644
--- a/Formatter/HtmlFormatter.php
+++ b/Formatter/HtmlFormatter.php
@@ -40,6 +40,11 @@ class HtmlFormatter extends AbstractFormatter
      */
     private $enableSandbox;
 
+    /**
+     * @var array
+     */
+    private $requestFormats;
+
     /**
      * @var string
      */
@@ -129,6 +134,14 @@ class HtmlFormatter extends AbstractFormatter
         $this->requestFormatMethod = $method;
     }
 
+    /**
+     * @param array $formats
+     */
+    public function setRequestFormats(array $formats)
+    {
+        $this->requestFormats = $formats;
+    }
+
     /**
      * @param string $format
      */
@@ -193,6 +206,7 @@ class HtmlFormatter extends AbstractFormatter
             'requestFormatMethod'  => $this->requestFormatMethod,
             'acceptType'           => $this->acceptType,
             'bodyFormat'           => $this->bodyFormat,
+            'requestFormats'       => $this->requestFormats,
             'defaultRequestFormat' => $this->defaultRequestFormat,
             'date'                 => date(DATE_RFC822),
             'css'                  => file_get_contents(__DIR__ . '/../Resources/public/css/screen.css'),
diff --git a/Resources/config/formatters.xml b/Resources/config/formatters.xml
index b50a2be..beaf429 100644
--- a/Resources/config/formatters.xml
+++ b/Resources/config/formatters.xml
@@ -37,6 +37,9 @@
             <call method="setRequestFormatMethod">
                 <argument>%nelmio_api_doc.sandbox.request_format.method%</argument>
             </call>
+            <call method="setRequestFormats">
+                <argument>%nelmio_api_doc.sandbox.request_format.formats%</argument>
+            </call>
             <call method="setDefaultRequestFormat">
                 <argument>%nelmio_api_doc.sandbox.request_format.default_format%</argument>
             </call>
diff --git a/Resources/doc/index.md b/Resources/doc/index.md
index 4adc186..b763562 100644
--- a/Resources/doc/index.md
+++ b/Resources/doc/index.md
@@ -326,11 +326,15 @@ configure this sandbox using the following parameters:
                                                     # sandbox requests
 
             request_format:
+                formats:                            # default `json` and `xml`,
+                    json: application/json          # override to add custom formats or disable
+                    xml: application/xml            # default formats
+
                 method: format_param    # default `format_param`, alternately `accept_header`,
                                         # decides how to request the response format
 
-                default_format: json    # default `json`, alternately `xml`, determines which
-                                        # content format to request back by default
+                default_format: json    # default `json`,
+                                        # default content format to request (see formats)
 
 ### Command
 
@@ -416,6 +420,9 @@ nelmio_api_doc:
         accept_type:          ~
         body_format:          form
         request_format:
+            formats:
+                json: application/json
+                xml: application/xml
             method:               format_param
             default_format:       json
         authentication:
diff --git a/Resources/views/layout.html.twig b/Resources/views/layout.html.twig
index c883b5b..66c173a 100644
--- a/Resources/views/layout.html.twig
+++ b/Resources/views/layout.html.twig
@@ -24,8 +24,9 @@
                     </select>
                     request format:
                     <select id="request_format">
-                        <option value="json"{{ defaultRequestFormat == 'json' ? ' selected' : '' }}>JSON</option>
-                        <option value="xml"{{ defaultRequestFormat == 'xml' ? ' selected' : '' }}>XML</option>
+                    {% for format, header in requestFormats %}
+                        <option value="{{ header }}"{{ defaultRequestFormat == format ? ' selected' : '' }}>{{ format }}</option>
+                    {% endfor %}
                     </select>
                     {% if authentication and authentication.delivery in ['query', 'http_basic', 'header'] %}
                         api key: <input type="text" id="api_key" value=""/>
@@ -197,13 +198,12 @@
                         method = method.split('|').sort().pop();
                     }
 
-                    // set default requestFormat
-                    var requestFormat = $('#request_format').val();
+                    // set requestFormat
                     var requestFormatMethod = '{{ requestFormatMethod }}';
                     if (requestFormatMethod == 'format_param') {
-                        params['_format'] = requestFormat;
+                        params['_format'] = $('#request_format option:selected').text();
                     } else if (requestFormatMethod == 'accept_header') {
-                        headers['Accept'] = 'application/' + requestFormat;
+                        headers['Accept'] = $('#request_format').val();
                     }
 
                     // set default bodyFormat