The OS marketing version number included in the default user-agent string is the OS X version of the host. It should be the iOS version of the Simulator.
<rdar://problem/17897271>
Created attachment 235947 [details] Locate System/Library relative to the Simulator root
Comment on attachment 235947 [details] Locate System/Library relative to the Simulator root I'm surprised that NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSSystemDomainMask, YES) doesn't do the right thing automatically for iOS.
<rdar://problem/17782529>
Fixed in <http://trac.webkit.org/r171984>.