GZIP 头解析

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;

}