Redirect non-www to www

To redirect requests without the www to www on sites on IIS7, adding the following rules to your web.config.
Make sure lirongyao.com below is changed to www.lirongyao.com.
NOTE: If you already have a web.config with rules configured, add the rule below, otherwise a full web.config example is below it.

Rule
=========================================================================

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

Full Web.Config with Rule
==========================================================================

<configuration>
  <system.webServer>
    <rewrite>
      <rules>
        <rule name=”Redirect to WWW” stopProcessing=”true”>
          <match url=”.*” />
<conditions>
            <add input=”{HTTP_HOST}” pattern=”^lirongyao.com$” />
</conditions>
          <action type=”Redirect” url=”http://www.lirongyao.com/{R:0}” redirectType=”Permanent” />
</rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>