diff --git a/synapse/http/server.py b/synapse/http/server.py
index 4b567215c8..f19c068ef6 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -37,7 +37,7 @@ from twisted.web.util import redirectTo
import collections
import logging
import urllib
-import ujson
+import simplejson
logger = logging.getLogger(__name__)
@@ -461,8 +461,7 @@ def respond_with_json(request, code, json_object, send_cors=False,
if canonical_json or synapse.events.USE_FROZEN_DICTS:
json_bytes = encode_canonical_json(json_object)
else:
- # ujson doesn't like frozen_dicts.
- json_bytes = ujson.dumps(json_object, ensure_ascii=False)
+ json_bytes = simplejson.dumps(json_object)
return respond_with_json_bytes(
request, code, json_bytes,
@@ -489,6 +488,7 @@ def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
request.setHeader(b"Content-Type", b"application/json")
request.setHeader(b"Server", version_string)
request.setHeader(b"Content-Length", b"%d" % (len(json_bytes),))
+ request.setHeader(b"Cache-Control", b"no-cache, no-store, must-revalidate")
if send_cors:
set_cors_headers(request)
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