Question

I have a website under IIS7 with catch all subdomain as *.mydomain.com
but some sites randomize subdomains like:

• www2.mydomain.com
• w.w.w.mydomain.com
• etc.mydomain.com

Any subdomain works perfectly loading my MVC page, but the google indexing doubles the url, because have two url differents.

I would redirect permanently “301” any subdomain to http://www.mydomain.com using global.asax keeping the url and query string. e.g.

• www2.mydomain.com/Controller/Action/ID?query=asb TO
  http://www.mydomain.com/Controller/Action/ID?query=asb

• w.w.w.mydomain.com/Controller/Action/ID?query=asb TO http://www.mydomain.com/Controller/Action/ID?query=asb

I want not to use IIS7 redirect because I will customize with C# the what subdomains should not be redirected.

I don´t like to create page base for all controller.

Answer 1

Assuming you are using IIS, you should be able to achieve this with ARR.

Example:

<rule name="SubDomain" stopProcessing="false">
                    <match url="(.*)" />
                    <conditions>
                        <add input="{HTTP_HOST}" pattern="^(?!www)(\w+)\.mine\.co\.uk$" />
                    </conditions>
                    <action type="Rewrite" url="{C:1}/{R:1}" />
</rule>  

Reference: http://forums.iis.net/p/1155754/1895646.aspx