HttpYac

httpYac is an open-source HTTP client created by German developer Andreas Weber, distributed as a Visual Studio Code extension and a CLI. It uses a plain-text .http file format compatible with the IntelliJ HTTP client and supports REST, SOAP, GraphQL, gRPC, MQTT, RabbitMQ and WebSocket requests directly from the editor. The response view pretty-prints JSON, XML and other formats and reuses VS Code's proxy settings. Variables, environment files, scripting and request chaining make it suitable for both ad-hoc API exploration and reproducible test scripts that can be checked into Git. The project is free.