alphagov/calculators — pull request #92 by Shotclog (2014-05-29 15:01:25+00:00)
Title: Adding gem to strip Client-IP headers

We've seen several instances of IpSpoofAttackError in Errbit recently, @alext's rack_strip_client_ip gem will hush these.
Detailed explanation here - alphagov/whitehall#810.