How to test WebSocket APIs: handshakes, auth, reconnection, and repeatable scenarios

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REST tools train you to think in request-response pairs. WebSocket APIs are conversations: after one HTTP upgrade handshake, either side can send a frame at any time, messages have types and sequence numbers, subscriptions start and stop over the same channel, and the interesting bugs are all about ordering, timing, and reconnection state. A client that can "connect and send JSON" passes the demo and fails in production. This is the testing workflow that actually covers a WebSocket API, from manual exploration to CI. Before a single application message, the connection is an HTTP/1.1 upgrade re

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