Merge pull request #4279 from matrix-org/hs/fix-config-cors

Make /config more CORS-y

changelog.d/4279.bugfix

@@ -0,0 +1 @@
+Send CORS headers for /media/config

synapse/rest/media/v1/config_resource.py

@@ -41,7 +41,7 @@ class MediaConfigResource(Resource):
     @defer.inlineCallbacks
     def _async_render_GET(self, request):
         yield self.auth.get_user_by_req(request)
-        respond_with_json(request, 200, self.limits_dict)
+        respond_with_json(request, 200, self.limits_dict, send_cors=True)
 
     def render_OPTIONS(self, request):
         respond_with_json(request, 200, {}, send_cors=True)