stubby4j

HTTP/1.1, HTTP/2, and WebSocket stub server for testing service-oriented and microservices architectures.

Webfree

stubby4j is a free, open-source stub server for simulating REST, SOAP, and WebSocket services over HTTP/1.1 and HTTP/2, used in integration and contract testing so tests don't depend on real external services. It runs as a standalone JAR, a Docker container, or embedded in a test suite, and supports fault injection, delayed responses, and record-and-replay. Built for developers and QA engineers.

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