Response.Filter属性：网站内容的GZIP压缩

Response.Filter属性：在数据发送出去前通过绑定的Filter来修改HTTP实体数据

应用场景（网站内容的GZIP压缩，多语言实现等等。。。）

定义：public Stream Filter{get;set;}

例如，实现网页压缩传输：

string str = Request.Headers.Get("Accept-Encoding");
if (str != null)
{
Stream filter = Response.Filter;
str = str.ToLower();
if (str.Contains("gzip"))
{
Response.Filter = new GZipStream(filter, CompressionMode.Compress);
Response.AppendHeader("Content-Encoding", "gzip");
}
else if (str.Contains("deflate"))
{
Response.Filter = new DeflateStream(filter, CompressionMode.Compress);
Response.AppendHeader("Content-Encoding", "deflate");
}
}