[1] List of HTTP status codes - Wikipedia, the free encyclopedia ( ( 版)) <http://en.wikipedia.org/wiki/List_of_HTTP_status_codes>
[2] List of HTTP status codes - Wikipedia, the free encyclopedia ( ( 版)) <http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#499>
HTTP/1.1 499 Client Disconnected Connection: keep-alive Server: Cowboy