在web.config文件指定rewrite中添加301重定向
<?xml version="1.0" encoding="UTF-8"?>
<configuration><system.webServer>
<rewrite>
<rules>
<rule name="301Redirect" stopProcessing="true">
<match url="(.*)" />
<conditions logicalGrouping="MatchAny">
<add input="{HTTP_HOST}" pattern="^abc.com$" />
</conditions>
<action type="Redirect" url="http://www.abc.com/{R:0}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>
实现的效果是abc.com访问时跳转到www.abc.com