delete method
Finds the Cache entry whose key is the request, and if found, deletes the Cache entry and returns a Promise that resolves to true. If no Cache entry is found, it returns false.
Implementation
Future<bool> delete(dynamic /*Request|String*/ request,
[CacheOptions? options]) =>
promiseToFuture(
_callMethod(_delegate, 'delete', [_wrapRequest(request), options]));