alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO NGrok Skip Browser Warning Header"; flow:established,to_server; http.header; content:"ngrok-skip-browser-warning|3a 20|"; fast_pattern; reference:url,ngrok.com/docs/traffic-policy/actions/add-headers; classtype:misc-activity; sid:2071232; rev:1; metadata:affected_product Any, attack_target Client_and_Server, tls_state TLSDecrypt, created_at 2026_07_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, updated_at 2026_07_20; target:src_ip;)