Log warning directly.

IPython/html/services/security/handlers.py

@@ -1,22 +1,23
 """Tornado handlers for security logging."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 from tornado import gen, web
 
 from ...base.handlers import IPythonHandler, json_errors
 from . import csp_report_uri
 
 class CSPReportHandler(IPythonHandler):
     '''Accepts a content security policy violation report'''
     @web.authenticated
     @json_errors
     def post(self):
         '''Log a content security policy violation report'''
         csp_report = self.get_json_body()
-        self.log.warn(csp_report)
+        self.log.warn("Content security violation: %s",
+                      self.request.body.decode('utf8', 'replace'))
 
 default_handlers = [
     (csp_report_uri, CSPReportHandler)
 ]