在网站根目录下建立web.config 文件，文件内容如下 

<?xml version="1.0" encoding="UTF-8"?>
<configuration> 
<system.webServer> 
<rewrite>
 <rules> 
<rule name="HTTP/S to HTTPS Redirect" enabled="true" stopProcessing="true"> <match url="(.*)" /> 
<conditions logicalGrouping="MatchAny"> <add input="{SERVER_PORT_SECURE}" pattern="^0$" /> </conditions> 
<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" /> 
</rule> 
</rules> 
</rewrite> 
</system.webServer>
</configuration>

即可实现每次用户只要在浏览器打开www.abc.com 即自动跳转到https://www.abc.com