public Html download(String url, String charset) {
        Page page = download(new Request(url), Site.me().setCharset(charset).toTask());
        return (Html) page.getHtml();
    }
A simple method to download a url.

@param url     url
@param charset charset
@return html
webmagic-core/src/main/java/us/codecraft/webmagic/downloader/AbstractDownloader.java