ProxyZip / Features / Breakpoints and rewrite

Pause a request, change it, send it on

Context menu on a request with Set breakpoint, Map Local, Map Remote and Block

Seeing traffic is half the job. The other half is changing it, so you can reproduce an error or try a fix without touching the server.

Breakpoints

Right-click a request and choose Set breakpoint. The next matching request stops before it leaves, or the response stops before it reaches the app. Edit the method, URL, headers or body, then let it continue or abort it.

Map Local and Map Remote

Map Local answers a request with a file on your disk, such as a JSON body you are experimenting with
Map Remote sends the request to another host, for example from production to staging

Rewrite rules

Rewrite headers, bodies and status codes by rule, with matching on the host, path and method. Rules apply to new requests as soon as you save.

Throttle and block

Throttle to Edge, 3G, 4G or a poor Wi-Fi preset to see loading states
Block a host to test offline behaviour
Add DNS overrides, an upstream proxy or record only the hosts you care about

Everything is a rule

Rules live in a JSON file you can load with proxyzip start --rules rules.json and keep in a workspace. The tools guide covers every option.

Next: mock a whole API.