A RUDY attack (R-U-Dead-Yet) is a Layer 7 slow attack vector, one of the low-bandwidth classes a thorough DDoS test is built to exercise. It is the slow-POST counterpart to Slowloris: the attacker submits an HTTP POST with a large declared Content-Length, then dribbles the request body to the server one byte at a time over a long interval. The server keeps each connection and its worker thread open waiting for a body that arrives glacially. A handful of these starved POSTs can tie up the entire connection pool while generating almost no traffic.
Why it matters in DDoS testing
RUDY exploits the server's willingness to wait, so it bypasses defenses that key on request volume or bandwidth. A test characterizes how many slow POSTs it takes to exhaust available workers, whether request-body timeouts and minimum-data-rate thresholds are configured, and how a reverse proxy that buffers full requests before forwarding changes the outcome. Slow attacks reward strict timeout discipline, which is why they appear in understanding DDoS attack vectors.