request works like Playwright's APIRequestContext (get, post, ... returning a response with status(), ok(), json(), headers()).
Write isHealthy(request) that calls GET /health and returns true only if the status is 200 and the body's status is "up".
`request` works like Playwright's API client: get/post/put/patch/delete with headers, params and data; responses have status(), ok(), json() and headers(). Create one yourself with mockApi({ "GET /health": { status: 200, body: { status: "up" } } }) to experiment.
