Redirect URL Get Page Name

If I have a URL like this

http://www.mysite.com/this-is-my-page/

I want to have the 404 page redirect it to

http://blog.mysite.com/this-is-my-page/

How can I do this?
theideabulbAsked:
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becraigCommented:
This would be based more on your web server / hosting setup as this would be done at the server level instead of a simple page redirect.

Can you provide some more info on your website setup.
theideabulbAuthor Commented:
I am using CF10 Enterprise.  IIS 7.5 Windows 2008R2
theideabulbAuthor Commented:
Here is what I did.  I dumped out the CGI variables on the 404.cfm page I had and noticed the url i needed was in the query_string. So this is what I did and so far its working well.  This will just be temporary until the search engines can catch up with the right urls.

<cfset theString = cgi.query_string>
<cfset strippedString = listlast(thestring,';')>
<cfset newurl = replacenocase(strippedString,'www','blog')>

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becraigCommented:
ok so I guess I am not clear you want 404's for a SPECIFIC request to go that URL or just any failed requests  ?

If this is for ANY requests to the www.xxx you can use a custom redirect using the steps below:
http://www.orcsweb.com/blog/jamie-furr/how-to-create-custom-error-pages-in-iis-7-5-with-asp-net/

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