cancel static method
Cancel an active download.
Implementation
static void cancel(String url) {
final state = _downloads[url];
if (state != null) {
state.cancelled = true;
state.request?.abort();
try {
if (state.controller != null && !state.controller!.isClosed) {
state.controller!.close();
}
} catch (_) {}
_downloads.remove(url);
}
}