bcardarella/client_side_validations — pull request #233 by coreyward (2011-12-06 22:12:39+00:00)
Title: Use 200 HTTP status code for server-side uniqueness validation.

“The 4xx class of status code is intended for cases in which the client seems to have erred.” — [RFC 2616](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4)