openid/ruby-openid — pull request #66 by asterite (2013-11-21 13:56:39+00:00)
Title: Fixed missing XRDS HTTP header in sample provider

Apparently doing:

response.headers['content-type'] = 'application/xrds+xml'

doesn't set the Content-Type header (I don't know why). You can try it with curl -v.

This is the cause for issue #65.