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Unauthenticated clients could exhaust process memory (and, for /store, disk) by posting arbitrarily large bodies, and could OOM or pin goroutines via the /ws/echo websocket. - Wrap request bodies in http.MaxBytesReader (10 MiB) on the echo, store, cache and token handlers via a shared readLimitedBody helper - Bound /ws/echo: per-message read limit, idle read deadline with ping/pong keepalive, and write deadlines - Add regression tests for both limits