C#实现页面GZip或Deflate压缩的方法

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;using System.IO.Compression;/// <summary>/// GzipDeflate 的摘要说明/// </summary>public class GzipDeflate:IHttpModule{  public GzipDeflate()  {    //    // TODO: 在此处添加构造函数逻辑    //  }  public void Init(HttpApplication app)  {    app.BeginRequest += new EventHandler(app_BeginRequest);  }  void app_BeginRequest(object sender, EventArgs e)  {    //HTTP头域可分为四类：通用头、请求头、响应头、实体头。    HttpApplication app=(HttpApplication)sender;    string acceptEncoding = app.Request.Headers["Accept-Encoding"];    //客户端支持的解码方式。属于请求头。    Stream requestStream = app.Response.Filter;    acceptEncoding = acceptEncoding.ToLower();    if(acceptEncoding.Contains("gzip"))    {      app.Response.Filter = new GZipStream(requestStream, CompressionMode.Compress);      app.Response.AppendHeader("Content-Encoding", "gzip");    }    else if(acceptEncoding.Contains("deflate"))    {      app.Response.Filter = new DeflateStream(requestStream, CompressionMode.Compress);      app.Response.AppendHeader("Content-Encoding", "deflate");      //属于实体头。    }  }  public void Dispose()  {  }}