Added a script designed to display HTTP headers.

scripts/http-headers.nse

@@ -0,0 +1,73 @@
+description = [[
+Does a GET request for the root folder ("/"), and displays the HTTP headers returned. 
+]]
+
+---
+--@output
+-- Interesting ports on scanme.nmap.org (64.13.134.52):
+-- PORT   STATE SERVICE
+-- 80/tcp open  http
+-- |  http-headers:  
+-- |   connection: close
+-- |   content-type: text/html; charset=UTF-8
+-- |   content-length: 739
+-- |   accept-ranges: bytes
+-- |   date: Sun, 23 Aug 2009 01:14:30 GMT
+-- |   etag: "fc8c91-2e3-44d8e17edd540"
+-- |   last-modified: Mon, 19 May 2008 04:49:49 GMT
+-- |_  server: Apache/2.2.2 (Fedora)
+-- 
+--
+
+
+author = "Ron Bowes <ron@skullsecurity.org>"
+
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+
+categories = {"discovery"}
+
+require "shortport"
+require "http"
+
+portrule = function(host, port)
+	local svc = { std = { ["http"] = 1, ["http-alt"] = 1 },
+				ssl = { ["https"] = 1, ["https-alt"] = 1 } }
+	if port.protocol ~= 'tcp'
+	or not ( svc.std[port.service] or svc.ssl[port.service] ) then
+		return false
+	end
+	-- Don't bother running on SSL ports if we don't have SSL.
+	if (svc.ssl[port.service] or port.version.service_tunnel == 'ssl')
+	and not nmap.have_ssl() then
+		return false
+	end
+	return true
+end
+
+action = function(host, port)
+	local result = http.get(host, port, "/")
+
+	if(result == nil) then
+		if(nmap.debugging() > 0) then
+			return "ERROR: GET request failed"
+		else
+			return nil
+		end
+	end
+
+	if(result.header == nil) then
+		if(nmap.debugging() > 0) then
+			return "ERROR: GET request didn't return a proper header"
+		else
+			return nil
+		end
+	end
+
+	local response = " \n"
+	for i, v in pairs(result.header) do
+		response = response .. string.format(" %s: %s\n", i, v)
+	end
+		
+	return response
+end
+