[1] HTTP Status Codes (Dan McCormick 著, 2011-10-07 11:42:55 +09:00 版) http://www.mccormickfamily.com/become-an-author/56-http-status-codes#509

[2] List of HTTP status codes - Wikipedia, the free encyclopedia ( (2012-02-16 13:47:30 +09:00 版)) http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

[3] List of HTTP status codes - Wikipedia, the free encyclopedia ( (2013-10-01 11:44:11 +09:00 版)) http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#509

[4] git-lfs/api.md at master · github/git-lfs (2015-04-09 12:31:37 +09:00 版) https://github.com/github/git-lfs/blob/master/docs/api.md?utm_source=gitlfs_site&utm_medium=api_spec_link&utm_campaign=gitlfs

509 - Returned if the bandwidth limit for the user or repository has been exceeded. The API does not specify any bandwidth limit, but implementors may track usage.