Local HTTP & WebSocket Proxy for SDK Testing

During SDK testing, it’s often useful to simulate real-world conditions or inspect communication between a client and a backend service. This lightweight local proxy helps developers spy on and inject both HTTP and WebSocket traffic for more effective debugging, experimentation, and test automation.

✨ Core Features

🔍 HTTP Inspection

• Spy on Outgoing HTTP Requests
• Modify Incoming HTTP Responses

🔍 WebSocket Inspection

• Spy on Outgoing WebSocket Messages
• Modify Incoming WebSocket Messages
• Inject WebSocket Messages

📦 Use Cases

• Validate SDK behavior against specific message sequences.
• Simulate dropped or malformed responses.
• Replay server messages for automated or regression testing.
• Monitor raw protocol-level activity to catch subtle bugs or race conditions.

🚀 Getting Started

Install npm dependency:

npm i -D @ably-labs/local-proxy