[1] HTTP Status Codes (Dan McCormick 著, 版) <http://www.mccormickfamily.com/become-an-author/56-http-status-codes#509>
[2] List of HTTP status codes - Wikipedia, the free encyclopedia ( ( 版)) <http://en.wikipedia.org/wiki/List_of_HTTP_status_codes>
[3] List of HTTP status codes - Wikipedia, the free encyclopedia ( ( 版)) <http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#509>
[4] git-lfs/api.md at master · github/git-lfs ( 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.