Handling Errors, Cleanup, and Race Conditions with useEffect

A request for an address that does not exist does not make fetch throw an error. The server answers with status 404, and fetch treats any answer as a success.

const response = await fetch("https://jsonplaceholder.typicode.com/postz");
console.log("ok =", response.ok, "status =", response.status);

ok = false status = 404

The promise returned by fetch rejects only when no answer arrives at all, for example when the user is offline or the address cannot be reached