From 936482d507ffbf59d9aee58f851ec6ff2a120424 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Tue, 16 Jan 2018 17:58:16 +0000 Subject: [PATCH] Fix 'NoneType' object has no attribute 'writeHeaders' Avoid throwing a (harmless) exception when we try to write an error response to an http request where the client has disconnected. This comes up as a CRITICAL error in the logs which tends to mislead people into thinking there's an actual problem --- synapse/http/server.py | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/synapse/http/server.py b/synapse/http/server.py index 269b65ca41..8077e22794 100644 --- a/synapse/http/server.py +++ b/synapse/http/server.py @@ -316,15 +316,6 @@ class JsonResource(HttpServer, resource.Resource): def _send_response(self, request, code, response_json_object, response_code_message=None): - # could alternatively use request.notifyFinish() and flip a flag when - # the Deferred fires, but since the flag is RIGHT THERE it seems like - # a waste. - if request._disconnected: - logger.warn( - "Not sending response to request %s, already disconnected.", - request) - return - outgoing_responses_counter.inc(request.method, str(code)) # TODO: Only enable CORS for the requests that need it. @@ -400,6 +391,15 @@ class RootRedirect(resource.Resource): def respond_with_json(request, code, json_object, send_cors=False, response_code_message=None, pretty_print=False, version_string="", canonical_json=True): + # could alternatively use request.notifyFinish() and flip a flag when + # the Deferred fires, but since the flag is RIGHT THERE it seems like + # a waste. + if request._disconnected: + logger.warn( + "Not sending response to request %s, already disconnected.", + request) + return + if pretty_print: json_bytes = encode_pretty_printed_json(json_object) + "\n" else: