compression done!
2007-08-18 @ 19:10#
ha! i love it when things come together. i found a very straight-forward article on how to use .NET 2.0 System.IO.Compression namespace to build an IHttpModule. i was able to implement that code in my framework in just minutes!
in a simple XML example i got some very noticeable bandwidth improvements. check out the before/after traces:
without compression
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.1
Date: Sat, 18 Aug 2007 23:14:15 GMT
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
X-Exyus: 0.8.2786.32458 2007-08
Last-Modified: Sat, 18 Aug 2007 23:14:15 GMT
ETag: meivvKmbEG4V0aXu2C59Ig==
Content-Type: text/xml; charset=utf-8
Content-Length: 12554
with compression enabled
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.1
Date: Sat, 18 Aug 2007 23:15:41 GMT
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Content-Encoding: gzip
X-Exyus: 0.8.2786.32458 2007-08
Last-Modified: Sat, 18 Aug 2007 23:15:41 GMT
ETag: meivvKmbEG4V0aXu2C59Ig==
Content-Type: text/xml; charset=utf-8
Content-Length: 1565
pretty cool, eh? and the code is really simple. below is the *entire* code set for adding support for streaming compression. just add the code below to your project and add the config entry to your web.config and your all set!
/*
<httpModules>
<add
type="Exyus.Web.HttpCompressionModule, Exyus"
name="HttpCompressionModule" />
</httpModules>
*/
using System;
using System.Web;
using System.IO.Compression;
namespace Exyus.Web
{
public class HttpCompressionModule : IHttpModule
{
void IHttpModule.Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
}
void IHttpModule.Dispose(){}
void context_BeginRequest(object sender, EventArgs args)
{
HttpApplication app = sender as HttpApplication;
if(IsEncodingAccepted("gzip"))
{
app.Response.Filter = new GZipStream(
app.Response.Filter,
CompressionMode.Compress);
SetEncoding("gzip");
}
else if (IsEncodingAccepted("deflate"))
{
app.Response.Filter = new DeflateStream(
app.Response.Filter,
CompressionMode.Compress);
SetEncoding("deflate");
}
}
private bool IsEncodingAccepted(string encoding)
{
return HttpContext.Current.Request.Headers["Accept-encoding"] != null &&
HttpContext.Current.Request.Headers["Accept-encoding"].Contains(encoding);
}
private void SetEncoding(string encoding)
{
HttpContext.Current.Response.AppendHeader("Content-encoding", encoding);
}
}
}