@leplatrem review.

cliquet/initialization.py

@@ -50,8 +50,7 @@ def setup_json_serializer(config):
     requests.models.json = utils.json
 
     # Override json renderer using ujson
-    renderer = JSONRenderer(serializer=lambda v, **kw: utils.json.dumps(
-        v, escape_forward_slashes=False))
+    renderer = JSONRenderer(serializer=utils.json_serializer)
     config.add_renderer('json', renderer)
 
 

cliquet/utils.py

@@ -7,14 +7,19 @@
 import time
 from base64 import b64decode, b64encode
 from binascii import hexlify
+from functools import partial
 from six.moves.urllib import parse as urlparse
 
-# ujson is not installable with pypy
+# ultrajson is not installable with pypy
 try:
     import ultrajson as json  # NOQA
+
+    json_serializer = partial(json.dumps, escape_forward_slashes=False)
 except ImportError:  # pragma: no cover
     import json  # NOQA
 
+    json_serializer = json.dumps
+
 try:
     # Register psycopg2cffi as psycopg2
     from psycopg2cffi import compat