How to create a redirect from non-www to www for IIS 7.0+

If you have IIS 7 installed with the web redirection module, you can use the following snippet to redirect http:// to http://www with one simple rule added to your system.webServer web.config section.

<rule name="Redirect to WWW" stopProcessing="true">
<match url=".*" />
<conditions>
    <add input="{HTTP_HOST}" pattern="^domain.com$" />
</conditions>
<action type="Redirect" url="http://www.domain.com/{R:0}" redirectType="Permanent" />

If you have a https website to contend with and you need all the traffic to go to the https version, use:

<rewrite>

  <rules>
    <rule name="Redirect to www" stopProcessing="true">
      <match url="(.*)" />
      <conditions trackAllCaptures="false">
        <add input="{HTTP_HOST}" pattern="^domain.com$" />
      </conditions>
      <action type="Redirect"
        url="{MapProtocol:{HTTPS}}://www.domain.com/{R:1}" />
    </rule>
  </rules>
  <rewriteMaps>
    <rewriteMap name="MapProtocol">
      <add key="on" value="https" />
      <add key="off" value="http" />
    </rewriteMap>
  </rewriteMaps>
</rewrite>
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