RequestCancelledException class

Exception for intentionally cancelled HTTP requests.

Thrown when a request is explicitly cancelled, typically due to:

• User navigating away from a screen
• Timeout cancellation by the app
• Request superseded by a newer request
• App termination or backgrounding

This is a normal operational condition rather than an error, so it usually should not trigger error alerts or logging.

Example:

try {
  await cancelToken.cancel('User navigated away');
} catch (e) {
  if (e is RequestCancelledException) {
    // Silently ignore - this is expected
    return;
  }
}