Wilma

What Wilma is

Wilma is a self-hosted tool for developing and testing applications that rely on other services. It combines an HTTP/HTTPS transparent proxy with a service stub: it can capture, decode, save, and forward traffic, including two-way SSL, or return configured responses to requests. It can operate as a proxy, a stub, or both. Stub behavior is set through JSON files, which can be changed through the UI or service while Wilma is running. Message interceptors can analyze or change requests and responses in real time; users can also add custom interceptors, condition checkers, and response formatters. Wilma Message Search finds logged request-response pairs. The project describes use in unit, integration, functional, end-to-end, performance, and manual testing. Under heavy load, Wilma can pause decoding and then disk logging, restoring them as load returns to normal. Old message logs can be deleted on a configurable schedule. It is available as Docker images, release ZIP files, or builds from source. Wilma requires JRE 11; Message Search requires JDK 11.