GetScreen

Fetches the payload of the screen this event lives in and emits it downstream, without applying it — pair it with ChangeScreenState to decide when and how the fetched content is installed, which is what makes custom loading and error flows possible. The request targets the screen's own id, shaped by method, body, headers and timeoutMillis. Does not consume incomingData. Dispatches onStart before the request is sent; onSuccess (carrying the fetched ScreenModel, ready for ChangeScreenState) when the screen was fetched; onNetworkFailure(status) (carrying the failure) when the request failed with an HTTP status and a child event is wired to that exact status; onFailure (carrying the Throwable, logged) for every other failure and for HTTP failures with no status-specific event declared — only one of the latter two fires per failure.

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