diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 4a85553..50550a3 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -39,6 +39,7 @@ class Configuration implements ConfigurationInterface
                     ->children()
                         ->scalarNode('enabled')->defaultTrue()->end()
                         ->scalarNode('endpoint')->defaultNull()->end()
+                        ->scalarNode('accept_type')->defaultValue('')->end()
                         ->arrayNode('request_format')
                             ->addDefaultsIfNotSet()
                             ->children()
diff --git a/DependencyInjection/NelmioApiDocExtension.php b/DependencyInjection/NelmioApiDocExtension.php
index 19790aa..2718679 100644
--- a/DependencyInjection/NelmioApiDocExtension.php
+++ b/DependencyInjection/NelmioApiDocExtension.php
@@ -32,6 +32,7 @@ class NelmioApiDocExtension extends Extension
         $container->setParameter('nelmio_api_doc.sandbox.enabled',  $config['sandbox']['enabled']);
         $container->setParameter('nelmio_api_doc.sandbox.endpoint', $config['sandbox']['endpoint']);
         $container->setParameter('nelmio_api_doc.sandbox.request_format.method', $config['sandbox']['request_format']['method']);
+        $container->setParameter('nelmio_api_doc.sandbox.accept_type', $config['sandbox']['accept_type']);
         $container->setParameter('nelmio_api_doc.sandbox.request_format.default_format', $config['sandbox']['request_format']['default_format']);
 
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
diff --git a/Formatter/HtmlFormatter.php b/Formatter/HtmlFormatter.php
index 8204891..9d5449f 100644
--- a/Formatter/HtmlFormatter.php
+++ b/Formatter/HtmlFormatter.php
@@ -45,6 +45,11 @@ class HtmlFormatter extends AbstractFormatter
      */
     private $requestFormatMethod;
 
+    /**
+     * @var string
+     */
+    private $acceptType;
+
     /**
      * @var array
      */
@@ -90,6 +95,14 @@ class HtmlFormatter extends AbstractFormatter
         $this->engine = $engine;
     }
 
+    /**
+     * @param string $acceptType
+     */
+    public function setAcceptType($acceptType)
+    {
+        $this->acceptType = $acceptType;
+    }
+
     /**
      * @param string $method
      */
@@ -144,6 +157,7 @@ class HtmlFormatter extends AbstractFormatter
             'endpoint'             => $this->endpoint,
             'enableSandbox'        => $this->enableSandbox,
             'requestFormatMethod'  => $this->requestFormatMethod,
+            'acceptType'           => $this->acceptType,
             'defaultRequestFormat' => $this->defaultRequestFormat,
             'date'                 => date(DATE_RFC822),
             'css'                  => file_get_contents(__DIR__ . '/../Resources/public/css/screen.css'),
diff --git a/README.md b/README.md
index 1c70635..898a74e 100644
--- a/README.md
+++ b/README.md
@@ -213,7 +213,7 @@ configure this sandbox using the following parameters:
                 delivery: query # only query delivery is supported for now
             enabled:  true # default: true, you can set this parameter to `false` to disable the sandbox
             endpoint: http://sandbox.example.com/ # default: /app_dev.php, use this parameter to define which URL to call through the sandbox
-
+            accept_type: application/json # default null, if set, the value is automatically populated as the Accept header
 
 The bundle provides a way to register multiple `input` parsers.  The first parser that can handle the specified
 input is used, so you can configure their priorities via container tags.  Here's an example parser service registration:
diff --git a/Resources/config/formatters.xml b/Resources/config/formatters.xml
index 6a8ae76..98f29c5 100644
--- a/Resources/config/formatters.xml
+++ b/Resources/config/formatters.xml
@@ -43,6 +43,9 @@
             <call method="setDefaultRequestFormat">
                 <argument>%nelmio_api_doc.sandbox.request_format.default_format%</argument>
             </call>
+            <call method="setAcceptType">
+                <argument>%nelmio_api_doc.sandbox.accept_type%</argument>
+            </call>
             <call method="setAuthentication">
                 <argument>%nelmio_api_doc.sandbox.authentication%</argument>
             </call>
diff --git a/Resources/views/method.html.twig b/Resources/views/method.html.twig
index 0930e7c..49272f3 100644
--- a/Resources/views/method.html.twig
+++ b/Resources/views/method.html.twig
@@ -211,6 +211,14 @@
                         <fieldset class="headers">
                             <legend>Headers</legend>
 
+                            {% if acceptType %}
+                                <p class="tuple">
+                                    <input type="text" class="key" value="Accept" />
+                                    <span>=</span>
+                                    <input type="text" class="value" value="{{ acceptType }}" /> <span class="remove">-</span>
+                                </p>
+                            {% endif %}
+
                             <p class="tuple">
                                 <input type="text" class="key" placeholder="Key" />
                                 <span>=</span>