Status codes & responses

What REST actually means

So far your handlers just wrote text back. A REST API is a discipline for shaping those handlers: you expose resources (walkers, bookings) and act on them with HTTP verbs.

• GET /walkers — read the list of walkers
• POST /bookings — create a booking
• GET /bookings/42 — read booking 42
• DELETE /bookings/42 — cancel it

The verb says what to do; the path names the thing. The PawWalk iOS app you built spoke exactly this language — every screen was a GET or a POST to a path like these.