Change effective on 27 August 2015
We’re rolling out a change that introduces a new warning code: H28 - Client Connection Idle.
This warning is logged if the client socket did not send a full request and was terminated due to 55 seconds of inactivity.
2010-10-06T21:51:37-07:00 heroku[router]: at=warning code=H28 desc="Client Connection Idle" method=GET path="/" host=myapp.herokuapp.com fwd=188.8.131.52 dyno=web.1 connect=1ms service=55449ms status=499 bytes=18
Previously this error condition caused an H15 to be logged. H15 still remains but now indicates that the dyno did not send a response in time and was terminated due to 55 seconds of inactivity.