>a) Link following >Whether it is only for url shorteners or for all links, simulating a click >could give us info on what will happen, but has implications when the website >interprets that like a click from the user and updates their database in >some >way such as unsubscribing a user. Be carefull with one time links !!!! Download only headers may be a good idea
Another idea may be to donwload headers with different user-agents . If we get different responses..... ----PedroD