Only access the header of xhr is present
Only access the header of xhr is present

Won't be present when you hit the back/forward button

AHaymond/peek,nidhinnambiar/peek,elkingtonmcb/peek,nidhinnambiar/peek,peek/peek,afeld/peek,afeld/peek,warseph/peek,warseph/peek,AHaymond/peek,afeld/peek,elkingtonmcb/peek,AHaymond/peek,warseph/peek,elkingtonmcb/peek,nidhinnambiar/peek,peek/peek,peek/peek