Redirect (301 ) Non WWW to WWW domain using Web.config in ASP.NET

Whenever we host a domain on server, we are able to access the webpage from http://www.mydomain.com as well as http://mydomain.com. For SEO purposes, this is not good as Google and other search engines penalises the website as duplicate content. To resolve this, we can redirect the non-www domain to www domain. In this post, we will see how can we do a “301 Redirect of a non WWW domain to WWW domain using web.config file in ASP.NET”.

To redirect mydomain.com to www.mydomain.com, edit your web.config file and add the following segment under the <system.webserver> section. Ensure you modify the words “mydomain.com” with your appropriate domain name.

<rewrite>
    <rules>
        <rule name="Redirect http://mydomain.com to http://www.mydomain.com HTTP" patternSyntax="ECMAScript" stopProcessing="true">
            <match url=".*"></match>
            <conditions>
                <add input="{HTTP_HOST}" pattern="^mydomain.com$"></add>
                <add input="{HTTPS}" pattern="off"></add>
            </conditions>
            <action type="Redirect" url="http://www.mydomain.com/{R:0}" redirectType="Permanent" appendQueryString="true"></action>
        </rule>
    </rules>
</rewrite>

Hope you like this. Keep learning and sharing.