LaniusA desktop web security testing proxy

Built on mitmproxy. See every request, stop it mid flight, change it, and send it again.

Battle-tested engine

Lanius embeds mitmproxy, so TLS interception, HTTP/2 and WebSocket handling are proven in the field.

Stop any request or response mid flight, edit it in a native editor with diffs and version history, and let it continue.

Re-send captured requests with modifications, or fuzz parameters with payload sets straight from the proxy history.

Extend Lanius with signed plugin packages from catalogues, or write your own against the stable lanius_sdk boundary.

Built-in MCP tools let AI agents drive captures, replays and scans alongside you.

Separate global and project switches block Lanius-owned external requests on sensitive networks while your proxy traffic keeps working.