通过GZIP或DEFLATE方式对所有页面进行压缩，会大大缩小页面传输的容量。可以使用Fiddler2来观察使用压缩后页面大小的变化。
在项目中添加Global.asax，然添加如下代码：
protected void Application_BeginRequest(object sender, EventArgs e)
{
HttpApplication app = (HttpApplication)sender;
string acceptEncoding = app.Request.Headers["Accept-Encoding"];
Stream prevUncompressedStream = app.Response.Filter;
if (acceptEncoding == null || acceptEncoding.Length == 0) return;
acceptEncoding = acceptEncoding.ToLower();
if (acceptEncoding.Contains("gzip"))
{
// gzip
app.Response.Filter = new GZipStream(prevUncompressedStream, CompressionMode.Compress);
app.Response.AppendHeader("Content-Encoding", "gzip");
}
else if (acceptEncoding.Contains("deflate"))
{
// defalte
app.Response.Filter = new DeflateStream(prevUncompressedStream, CompressionMode.Compress);
app.Response.AppendHeader("Content-Encoding", "deflate");
}
}