Architecture
proxymock is a local tool that allows you to create a mock server from a recording of your application's traffic. It is a great way to get started with traffic replay. proxymock is free and the UI is open source. It DOES NOT require a subscription to Speedscale Enterprise. The backend for proxymock is actually a local Speedscale Enterprise mock server and so it is already enterprise-grade even though it's free.
Ideally, proxymock installs a VSCode extension that modifies your debugger environment to use the proxymock mock server. The actual work is done by a local cli called proxymock. The proxymock cli contains most of the business logic for creating and managing mock servers with the UI acting as a layer on top of it. The proxymock cli is not open source but the VSCode extension is.
The proxymock cli utilizes a proxy to redirect traffic. When it works, it's essentially fully automatic. When you have an unusual configuration, you may want to do some of the networking yourself to reach the cli.
When using a supported environment, you do not need to change any application code or configuration. This all happens transparently when you start a debugger session. If it doesn't work automatically, you can use the proxymock cli to manually configure the proxy.
proxymock sends telemetry data to speedscale to help us improve the product and know what features are important. It does not send any information about the specific nature of your traffic (like URLs, ports or other sensitive data). If you don't believe us, feel free to sniff the traffic and see for yourself.