# Failure modes · Docs | Lagsmith

> Airplane Mode for one app, refused connections, time-outs, dropped connections, intermittent outages, and failing or mocking a single endpoint.

Source: https://lagsmith.com/docs/failures

# Failure modes

## Airplane Mode

Takes one app offline. In the iOS Simulator it behaves like a real device for apps launched with request monitoring:

-   requests fail with “The Internet connection appears to be offline”,
-   `NWPathMonitor` reports no network,
-   `SCNetworkReachability` (used by Alamofire and Reachability.swift) reports no network.

## Connection failures

-   **Refuse connections**: refuse a percentage of new connections.
-   **Time out**: every request times out.
-   **Drop connections**: drop connections after a number of seconds.
-   **Outages**: go offline and come back, repeatedly.

## Fail or mock one endpoint

In simulator apps, pick an endpoint and make it go offline, time out, return an HTTP status or respond with a delay, or mock it with a made-up response starting from the real one. The rest of the app keeps working. [More about mocking endpoints](https://lagsmith.com/mock-api-ios-simulator).

## Slow down one app, not your whole Mac

Free to download, with a 14-day Pro trial. No account, no card. Requires macOS 13 Ventura or later.

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