You can use IIS 7 URL Rewriting module
You can setup it from IIS or just place in your web.config
the following under <system.webServer>
:
www to non-www
<rewrite>
<rules>
<rule name="Canonical" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^www[.](.+)" />
</conditions>
<action type="Redirect" url="http://{C:1}/{R:0}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>
Alternatively you can make this redirection on global.asax.cs
:
protected void Application_BeginRequest(object sender, EventArgs ev)
{
if (Request.Url.Host.StartsWith("www", StringComparison.InvariantCultureIgnoreCase))
{
Response.Clear();
Response.AddHeader("Location",
String.Format("{0}://{1}{2}", Request.Url.Scheme, Request.Url.Host.Substring(4), Request.Url.PathAndQuery)
);
Response.StatusCode = 301;
Response.End();
}
}
But remeber what @Sam said, look here for more info.
non-www to www
<rewrite>
<rules>
<rule name="Canonical" stopProcessing="true">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^([a-z]+[.]net)$" />
</conditions>
<action type="Redirect" url="http://www.{C:0}/{R:0}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>
Make a regex pattern to match your host and use {C:0}
1, 2, ..., N
to get the matching groups.