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Re:Whatever you set the URL to, that HTTP code will be returned by iam4xzor on Tuesday January 26, 2016 @05:28PM (#10976704)
Re:Whatever you set the URL to, that HTTP code will be returned by delinka on Tuesday January 26, 2016 @07:02PM (#10977238)
Anything unexpected returns 503. Try http://codes.io/404/ (notice the ending /)

Besides, 1223 isn't specified by the HTTP RFCs, nor is it returned anywhere except from a library call in a buggy library. I'd say it's not appropriate for an HTTP testing service to support 1223.