alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY HTTP HEAD invalid method case outbound"; flow:established,to_server; http.method; content:"head"; nocase; content:!"HEAD"; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec9.html; classtype:bad-unknown; sid:2014381; rev:4; metadata:created_at 2012_03_15, confidence High, signature_severity Informational, updated_at 2020_08_25;)