.NET：是否有可能得到的HttpWebRequest自动DECOM preSS gzip压缩的反应？ [英] .NET: Is it possible to get HttpWebRequest to automatically decompress gzip'd responses?

问题描述

在<一个href="http://stackoverflow.com/questions/2813989/how-do-i-read-a-secure-rss-feed-into-a-syndicationfeed-without-providing-credenti/2815624#2815624">this回答，我描述了我是如何使出了HttpWebResponse wrappnig各地的响应流的GZipStream，以DECOM preSS它。

In this answer, I described how I resorted to wrappnig a GZipStream around the response stream in a HttpWebResponse, in order to decompress it.

相关code是这样的：

The relevant code looks like this:

HttpWebRequest hwr = (HttpWebRequest) WebRequest.Create(url);
hwr.CookieContainer =
    PersistentCookies.GetCookieContainerForUrl(url);
hwr.Accept = "text/xml, */*";
hwr.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
hwr.Headers.Add(HttpRequestHeader.AcceptLanguage, "en-us");
hwr.UserAgent = "My special app";
hwr.KeepAlive = true;

using (var resp = (HttpWebResponse) hwr.GetResponse()) 
{
    using(Stream s = resp.GetResponseStream())
    {
        Stream s2 = s;
        if (resp.ContentEncoding.ToLower().Contains("gzip"))
            s2 = new GZipStream(s2, CompressionMode.Decompress);
        else if (resp.ContentEncoding.ToLower().Contains("deflate"))
            s2 = new DeflateStream(s2, CompressionMode.Decompress);

         ... use s2 ...
    }
}

有没有办法让HttpWebResponse为解-COM pressing流，自动？换句话说，这是一种对我来说，以消除上述code以下内容：

Is there a way to get HttpWebResponse to provide a de-compressing stream, automatically? In other words, a way for me to eliminate the following from the above code:

      Stream s2 = s;
      if (resp.ContentEncoding.ToLower().Contains("gzip"))
          s2 = new GZipStream(s2, CompressionMode.Decompress);
      else if (resp.ContentEncoding.ToLower().Contains("deflate"))
          s2 = new DeflateStream(s2, CompressionMode.Decompress);

感谢。

推荐答案

使用的<一个href="http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.automaticdecom$p$pssion.aspx">HttpWebRequest.AutomaticDecom$p$pssion属性如下：

HttpWebRequest hwr = (HttpWebRequest) WebRequest.Create(url);
hwr.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;

这是没有必要手动添加接受编码 HTTP标头;当属性用于它会自动被添加。

It's not necessary to manually add the Accept-Encoding HTTP header; it will automatically be added when that property is used.

（另外，我知道这只是例子code，但 HttpWebResponse 对象应放置在使用块，它的正确处置，当你使用它已经完成了。）

(Also, I know this is just example code, but the HttpWebResponse object should be placed in a using block so it's disposed correctly when you've finished using it.)

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