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Advice Request: using interceptor to bounce user back to

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functionality required is that I have an opening page whereby the user should select what subdomain of a site they would like to visit. this is appended as a request parameter as in:

My intention is that an interceptor (DomainInterceptor) which I am trying to code will always investigate every request such that the user will be redirected back to the select domain page if the domain variable is not found in either the request parameter (used initially, e.g. action?domain=3043204), a stored cookie (used for long term and user returns).

My problem is that I cant get the interceptor to locate the request parameter. was wondering if anyone had any suggestions about which way to go. This is a standard functionality, if you goto the page for the first time you'll see exactly what I want to do. The issue is that after the user selects their "subdomain" this cookie/parameter will be required in the rest of the web-application to tell it what "domain specific" content to load for each page.

Note: This interceptor is configured to execute after the defaultStack

similar examples:
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How are you accessing the request? AFAIK this works without issue. As an example, see the "servletConfig" interceptor (or whatever it's called) that sets the request parameters into the action.
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