diff --git a/Resources/public/css/screen.css b/Resources/public/css/screen.css
index e076719..234b5c5 100644
--- a/Resources/public/css/screen.css
+++ b/Resources/public/css/screen.css
@@ -440,7 +440,7 @@ li.operation.patch div.content h4 {
 }
 
 .pane.sandbox legend {
-  margin-bottom: 5px;
+  padding-bottom: 5px;
 }
 
 .remove {
@@ -451,12 +451,22 @@ li.operation.patch div.content h4 {
   display: none;
 }
 
-.parameters {
+form .parameters,
+form .headers,
+form .request-content {
   float: left;
-  width: 50%;
+  width: 33%;
 }
 
 .buttons {
   clear: both;
   padding-top: 10px;
 }
+
+.request-content textarea {
+    width:100%;
+    min-width:100%;
+    max-width:100%;
+    height:5em;
+    margin-bottom:10px;
+}
diff --git a/Resources/views/layout.html.twig b/Resources/views/layout.html.twig
index 6afc12b..7354892 100644
--- a/Resources/views/layout.html.twig
+++ b/Resources/views/layout.html.twig
@@ -132,6 +132,7 @@
                         _format: 'json' // default format if not overriden in the form
                     },
                     headers = {},
+                    content = $(this).find('textarea.content').val();
                     result_container = $('.result', $(this).parent());
 
                 // retrieve all the parameters to send
@@ -173,13 +174,13 @@
                 $.ajax({
                   url: '{{ sandboxTarget }}' + url,
                   type: method,
-                  data: params,
+                  data: content.length ? content : params,
                   headers: headers,
                   complete: function(xhr) {
                       displayResponse(xhr, method, url, result_container);
 
                       // and enable them back
-                      $('input, button', $(self)).removeAttr('disabled');
+                      $('input:not(.content-type), button', $(self)).removeAttr('disabled');
                   }
                 });
 
@@ -226,6 +227,36 @@
             $('.pane.sandbox').on('click', '.remove', function() {
                 $(this).parent().remove();
             });
+
+            $('.pane.sandbox').on('click', '.set-content-type', function(e) {
+                var html;
+                var $element;
+                var $headers = $(this).parents('form').find('.headers');
+                var content_type = $(this).prev('input.value').val();
+
+                e.preventDefault();
+
+                if (content_type.length === 0) {
+                    return;
+                }
+
+                $headers.find('input.key').each(function() {
+                    if ($.trim($(this).val().toLowerCase()) === 'content-type') {
+                        $element = $(this).parents('p');
+                        return false;
+                    }
+                });
+
+                if (typeof $element === 'undefined') {
+                    html = $(this).parents('.pane').find('.tuple_template').html();
+
+                    $element = $headers.find('legend').after(html).next('p');
+                }
+
+                $element.find('input.key').val('Content-Type');
+                $element.find('input.value').val(content_type);
+
+            });
         </script>
     </body>
 </html>
diff --git a/Resources/views/method.html.twig b/Resources/views/method.html.twig
index 673848e..144eddd 100644
--- a/Resources/views/method.html.twig
+++ b/Resources/views/method.html.twig
@@ -136,8 +136,20 @@
                     <button class="add">New header</button>
                 </fieldset>
 
-                <div class="buttons">
+                <fieldset class="request-content">
+                    <legend>Content</legend>
 
+                    <textarea class="content" placeholder="Content set here will override the parameters that do not match the url"></textarea>
+
+                    <p class="tuple">
+                        <input type="text" class="key content-type" value="Content-Type" disabled="disabled" />
+                        <span>=</span>
+                        <input type="text" class="value" placeholder="Value" />
+                        <button class="set-content-type">Set header</button> <small>Replaces header if set</small>
+                    </p>
+                </fieldset>
+
+                <div class="buttons">
                     <input type="submit" value="Try!" />
                 </div>
             </form>