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Clients for connecting to WebSocket servers to send messages and inspect real-time connection state.
Distinct from WebSocket Connections: None of the candidates cover general-purpose WebSocket testing clients for API development; they are narrowly focused on brokers, redirects, or scripts.
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Swell is an API development and testing client designed for interacting with modern network protocols, executing GraphQL operations, and running local mock servers. It provides a unified interface for connecting to endpoints served over HTTP/2, WebSockets, Server-Sent Events, gRPC, tRPC, and WebRTC, enabling live messaging, monitoring, and debugging. The platform includes a concurrent load testing engine that spawns parallel worker threads to evaluate endpoint performance under heavy traffic, alongside a local mock server engine for simulating backend responses during frontend development. It
Connects to WebSocket servers to send messages, stream real-time data, and inspect connection state.