i got it dude

responder/formats.py

@@ -3,21 +3,24 @@ import json
 
 
 def format_form(r, encode=False):
-    return r._wz.form
+    if not encode:
+        return r._wz.form
 
 
 def format_yaml(r, encode=False):
     if encode:
-        return yaml.load(r.content)
-    else:
+        r.headers.update({"Content-Type": "application/x-yaml"})
         return yaml.dump(r.media)
+    else:
+        return yaml.load(r.content)
 
 
 def format_json(r, encode=False):
     if encode:
-        return json.loads(r.content)
-    else:
+        r.headers.update({"Content-Type": "application/json"})
         return json.dumps(r.media)
+    else:
+        return json.loads(r.content)
 
 
 def get_formats():

responder/models.py

@@ -99,11 +99,7 @@ class Response:
 
         for format in self.formats:
             if self.req.accepts(format):
-                return (
-                    self.formats[format](self),
-                    self.mimetype or "application/x-yaml",
-                    {"Content-Type": "application/x-yaml"},
-                )
+                return self.formats[format](self, encode=True), None, {}
 
         # Default to JSON anyway.
         else: