alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET POLICY HTTP OPTIONS invalid method case outbound"; flow:established,to_server; content:"options "; depth:8; nocase; content:!"OPTIONS "; depth:8; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec9.html; classtype:bad-unknown; sid:2014382; rev:2; metadata:created_at 2012_03_15, confidence High, signature_severity Informational, updated_at 2019_07_26;)