URL Rewrite for IIS 7 IP to Domain name - iis

Question

I have a request from a client that they would like for me to have this happen. When a user on the web goes to http://x.x.x.x have it 301 redirect to their domain name http://www.domain.com . I have messed around with rules in URL Rewrite and I have no problem specifying the conditions to determine the request for the IP address, etc. But when I do the redirect, the site goes into a redirect loop.
My question is how can I do this ? I know this is basically redirecting to the same place, hence the loop, but is there any way to make this happen ? For SEO reasons, they don't want visitors to the site to be able to get it via the public IP.
Thanks,
Chris
//////
Ok All, Thanks to some direction and good ideas from Caner, I was able to figure it out.
Here is the ASP code I used:
<%
if Request.ServerVariables("HTTP_X_HOST") = "" then
Dim rd
rd = "http://www.xxx.com" & Request.ServerVariables("PATH_INFO")
Response.Status="301 Moved Permanently"
Response.AddHeader "Location",rd
Response.end
end if
%>
Thanks to all the suggestions!
Chris

Answer 1

It is a kind of tricky, but instead of configuring this on IIS, I suggest your client to add some code in their header file( header.asp file, site.master etc..);
This code can check the request; and you can reach HttpContext.Current.Request.Url.Host.
Using HttpContext.Current.Request.Url.Host, you can do a redirect.
string currentURL = HttpContext.Current.Request.Url.Host;
if(!currentURL.StartsWith("www."))
{
string newURL = HttpContext.Current.Request.Url.Host;
if(currentURL =="www.x.x.x.x")
newURL ="www.domain.com";
newURL += HttpContext.Current.Request.Url.PathAndQuery;
Response.Redirect(newURL);
}
Hope this helps.