We have a rails app setup that uses devise & omniauth to allow logging in via facebook authentication. We also have a mobile app that is currently using http authentication
If you are setting request headers in xcode 4.3.2 you could use:
[request setValue:@"12345" forHTTPHeaderField:@"fbaccesstoken"];
but you cannot use:
[request setValue:@"12345" forHTTPHeaderField:@"fb_access_token"]; // does NOT get set