Base
Hardened build
minimal ports, security patches applied at build time
Hoverfly API Simulation Proxy on Ubuntu 24.04 LTS
Azure
Developer Tools
Hoverfly, a lightweight API simulation and service virtualization proxy that replaces slow, flaky or unavailable HTTP APIs with fast, deterministic virtual services.
Overview
Hoverfly is a lightweight, open source API simulation and service virtualization tool. It sits as a proxy in front of the HTTP and HTTPS services your application depends on, and can capture real traffic, replay it as fast, deterministic virtual services, spy on requests, or modify responses on the fly. This lets teams develop and test against realistic simulations of third party or internal APIs that are slow, rate limited, costly or not yet built, and reproduce specific responses, latencies and failure modes on demand. It runs as a single self contained binary driven by simulation files and the hoverctl command line tool, with a REST admin API for automation.
Why the cloudimg image
cloudimg ships Hoverfly as a hardened systemd service that is running the moment the instance boots, with a working demo simulation so a real service virtualization round trip is provable immediately. It is secure by default: Hoverfly's admin API is unauthenticated out of the box, so this image enables authentication and generates a unique admin password and signing secret on each instance's first boot, written to a root only file, with nothing baked into the image. The admin API is bound to loopback behind a reverse proxy and protected by its own token authentication, and the proxy port is kept private by default rather than exposed as an open relay. Paired with a step by step deploy guide and backed by 24/7 support.
Common uses
- Simulate slow, flaky, rate limited or unavailable third party APIs for development and testing
- Capture real HTTP traffic and replay it as fast, deterministic virtual services
- Reproduce specific responses, latencies and failure modes on demand in CI
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