Http check

This is tricky. Just about anything could be a valid http header value. So I started with csv and went from there. My current test config looks like the following:

http-check = http://198.252.206.16:80/,/,"question",foo: bar, biz: baz,host :stackoverflow.com
http-check = http://stackexchange.com/,/,"question",foo: bar, biz: baz
http-check = http://192.168.1.230/,ARoute,"question"