I'm aware of that header, but respecting it is voluntary, which is highly unlikely to work if there is a strong monetary incentive not to comply. It's also pre

I'm aware of that header, but respecting it is voluntary, which is highly unlikely to work if there is a strong monetary incentive not to comply. It's also pretty coarse. I may want to allow a site I like to collect analytics to help them out, I may even want a search engine to keep track of my behaviour to give me better results. Just an on/off, where IE has set the default to off, was never going to work.