rtb and tsung are nice projects to benchmark XMPP servers, but they don't support connecting via WebSocket. This simply translates plaintext C2S XMPP to TLS WebSocket, quickly, using xmpp-proxy. It explicitly doesn't do any DNS or certificate validation, so only use it for benchmarking. If you need that, use xmpp-proxy directly.
GNU/AGPLv3 - Check LICENSE.md for details