Icm/HTTP/redirect_0 paramter in webdispatcher

Hello,
As anybody used this paramter and used the optional one i.e FROM, FOR, TO etc ..
icm/HTTP/redirect_<xx> = PREFIX=<URL prefix>[, FROM=<pattern for URL>, FROMPROT=<incoming protocol>, FOR=<pattern for host name:port>,TO=<new URL prefix>, PROT=<protocol>, HOST=<host>, PORT=<port number/name>]
reguest to share the same, ( u can mask the hostname ), intrested in understanding the syntax.
and also wanted to know what is the url user is using on the browser such that it re-directs to weddisphostname:portno/irj
regards
VM

Hello,
Let me re-phrase my question,
as an end user, i need to use an url i.e http://mycompany.abc.de.com
this should redirect to the http://<webdispatcher-hostname.domainname>:portnumber/irj/portal
which inturn open the portal page.
iam trying to use the parameter icm.http/redirect_0 to acheive this.
am i missing something.
if u have tried this, please share ur knowledge.
please confirm
regards

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