>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.....



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