HtmlAgilityPack下载开启压缩的页面乱码

当一个被采集的网页是开启压缩了的话，如果使用HtmlAgilityPack 的HtmlWeb默认配置去下载，下载回来的HTML代码是乱码，应该进行如下操作

    HtmlWeb web = new HtmlWeb();
    HtmlAgilityPack.HtmlWeb.PreRequestHandler handler = delegate(HttpWebRequest request)
    {
     request.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate";
     request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
     request.CookieContainer = new System.Net.CookieContainer();
     return true;
    };
    web.PreRequest += handler;
    web.OverrideEncoding = Encoding.Default;

而如果仅仅只是网页的编码问题，则只需要配置这个参数：

web.OverrideEncoding = Encoding.Default;