At what point in the ASP.NET page/app life-cycle should I redirect a user based on his country?

Question

We have a web app where we need to redirect customers from .com to .co.uk domains based on the geolocation of ther IP address. When/where should I do this?

The content will change slightly based on their location, but I think I can handle that OK. However, if anyone has any comments on the best way to handle this, I'd like to hear those comments as well.

Answer 1

I would use an HttpModule. It's the earliest place to do the redirection.

Answer 2

If you want to do this in application code, I would do this as early as the IP is available, in the Application_BeginRequest handler in global.asax:

protected void Application_BeginRequest(object sender, EventArgs e)
{
  var ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
  //Redirect here...
}