How to define multple host urls in liferay

[abc abc，修改在12 年前。]

HI,
There is a requirement in our liferay portal site that to accelerate user request based on a specific user setting.
For example
my default web.server.host property value in portal-ext.properties is portal.abc.com
web.server.host=portal.abc.com
if user A logged in he will be redirected to portal.abc.com

If user B (who has above mentioned specific setting ON)logged in then i need to redirect this user to another host i.e portal2.abc.com.

Can i define comma seperated urls as the value of web.server.host?
like
web.server.host=portal.abc.com , portal2.abc.com
I tried this but it doesn't work.
Can any body please suggest me how can i handle this scenario as early as possible?

Thanks
S