@Deprecated
    protected void onError(Request request, Task task, Throwable e) {
        this.onError(request);
    }
@param request the {@link Request}.
@param task the {@link Task}.
@param e the exception.
@since 0.7.6
@deprecated Use {@link #onError(Page, Task, Throwable)} instead.
webmagic-core/src/main/java/us/codecraft/webmagic/downloader/AbstractDownloader.java