Htrosbif HTTP Server Fingerprinting Tool

htrosbif is a tool that actively probes an HTTP server. It prods the Web server in all sorts of old, new, basic, fancy, spec-compliant, and spec-breaking ways. It tries to characterize both the well-spoken educated responses and the seriously deviant babble it receives in return. Signatures contain no user data, only header names and HTTP-level quirks. As a useful side effect, this might detect reverse proxies, HTTP load balancers, intrusion prevention systems, and Web application firewalls.