【转载】HttpWebRequest开启gzip压缩简介

在用HttpWebRequest对象时，一般我们都没有开启gzip压缩，如果服务端返回的数据比较大，这是我们需要开启gzip压缩，怎么开启呢？

1.给HttpWebRequest对象，添加如下Header：

request.Headers.Add("Accept-Encoding", "gzip");

2.对接收到的流进行解码：

private string GetResponseBody(HttpWebResponse response)
{
string responseBody = string.Empty;
if (response.ContentEncoding.ToLower().Contains("gzip"))            
　　{
using (GZipStream stream = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress))
        {
using (StreamReaderreader = new StreamReader(stream))
            {
                responseBody = reader.ReadToEnd();
            }
        }
    }
else if (response.ContentEncoding.ToLower().Contains("deflate"))
    {
using (DeflateStream stream = new DeflateStream(
            response.GetResponseStream(), CompressionMode.Decompress))
        {
using (StreamReader reader = 
new StreamReader(stream, Encoding.UTF8))
            {
                responseBody = reader.ReadToEnd();
            }
        }
    }
else
    {
using (Stream stream = response.GetResponseStream())
        {
using (StreamReader reader =  new StreamReader(stream, Encoding.UTF8))
            {
                responseBody = reader.ReadToEnd();
            }
        }
    }
return responseBody;
}

转自：http://www.csharpwin.com/csharpspace/13345r5893.shtml