Consider less entropic Accept and Accept-Languages

[Cris Dywan]

As http://ip-check.info/ suggests:

en-us may be a more widely used language setting - currently we use "en" in private browsing

text/html,application/xml,*/* may be a more generic Accept header

I'm a little sceptical on some advice ip-check.info gives, for example it recommends Do-Not-Track without any further explanations or reading material. And it doesn't in general. Having said that, maybe it's worth considering the above ideas.