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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 no definition for this particular http-header that google seems to be spouting out: GET / HTTP/1.1 HTTP/1.1 200 OK Date: Wed, 01 Feb 2012 03:42:24 GMT Expires: -1 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Set-Cookie: PREF=ID=6ddbc0a0342e7e63:FF=0:TM=1328067744:LM=1328067744:S=4d4farvCGl5Ww0C3; expires=Fri, 31-Jan-2014 03:42:24 GMT; path=/; domain=.google.com Set-Cookie: NID=56=PgRwCKa8EltKnHS5clbFuhwyWsd3cPXiV1-iXzgyKsiy5RKXEKbg89gWWpjzYZjLPWTKrCWhOUhdInOlYU56LOb2W7XpC7uBnKAjMbxQSBw1UIprzw2BFK5dnaY7PRji; expires=Thu, 02-Aug-2012 03:42:24 GMT; path=/; domain=.google.com; HttpOnly P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info." Server: gws X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Transfer-Encoding: chunked 1000 Anyone know what X-XSS-Protection is?

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