alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Bluecoat Proxy in use"; flow:established,to_server; http.header_names; to_lowercase; content:"|0d 0a|x-bluecoat-via|0d 0a|"; classtype:not-suspicious; sid:2014049; rev:6; metadata:created_at 2011_12_30, confidence High, signature_severity Informational, updated_at 2024_05_06;)