Fix localhost server to work with rubinius.
Fix localhost server to work with rubinius.

For some reason, the object_id of the rack app is different in different threads on rubinius, but not on other rubies.
intfrr/vcr,irfanah/vcr,irfanah/vcr,ZmagoD/vcr,Shopify/vcr,mcfiredrill/vcr,intfrr/vcr,myronmarston/vcr,cemo/vcr,cemo/vcr,davidbebb/vcr,nishanbose/vcr,myronmarston/vcr,asymmetric/vcr,chriswoodrich/vcr,chriswoodrich/vcr,ZmagoD/vcr,asymmetric/vcr,davidbebb/vcr,benjaminoakes/vcr,mcfiredrill/vcr,ihassin/vcr,Shopify/vcr,allyapp/vcr,allyapp/vcr,ihassin/vcr,nishanbose/vcr