What is the http-header “X-XSS-Protection”?

So I’ve been toying around with HTTP for fun in telnet now (i.e. just typing in telnet google.com 80 and putting in random GETs and POSTs with different headers and the like) but I’ve come across something that google.com transmits in it’s headers that I don’t know. I’ve been looking through http://www.w3.org/Protocols/rfc2616/rfc2616.html and have found … Read more