Fix json detection in response

1 files changed, 2 insertions, 2 deletions

diff --git a/webtest/response.py b/webtest/response.py
index f6027fd..b091f01 100644
--- a/webtest/response.py
+++ b/webtest/response.py
@@ -493,9 +493,9 @@ class TestResponse(webob.Response):
         <http://goo.gl/B9g6s>`_ installed to use this, or be using a Python
         version with the json module.
 
-        The content type must be application/json to use this.
+        The content type must be one of json type to use this.
         """
-        if self.content_type != 'application/json':
+        if not self.content_type.endswith(('+json', '/json')):
             raise AttributeError(
                 "Not a JSON response body (content-type: %s)"
                 % self.content_type)