Default request headers

[billagee]

It would be nice if curly filled in a default set of request headers as you enter a URL to hit.

The user should be able to still add or remove headers before submitting or saving their request.

Ideas for default headers and values:

Host: (perhaps the host value could automatically contain the hostname the user typed into the URL box, if they've typed anything there yet)
User-Agent: curly
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8