citricsquid/httpstatus.es — pull request #16 by Hywan (2014-11-05 08:51:16+00:00)
Title: 103 is not a standard, this was only a draft.

The 103 status comes from here: https://code.google.com/p/gears/wiki/ResumableHttpRequestsProposal. It has never been in HTTP1.1, it was a draft.

Moreover, the Wikipedia link is not up-to-date.