Landing

It would be easier to troubleshoot if you post your current rule and a bit more detail on what you are trying to do.

If you simply need to redirect all requests going to a particular host ( you should be able to do so by matching on the host ([HTTP::host]). That should ignore any path information.

I didn't see a section in your iRule that looks like you're trying to send certain traffic to a maintenance page. I did find a couple of links that may be helpful if you are trying to create such a redirect. The following links show how to match on the HTTP::host and redirect accordingly. The second link is a helpful example of how to redirect all subdomains of a particular domain.

https://devcentral.f5.com/questions/httphost-and-if-match-redirect-by-using-httpredirect

DevCentral: Match all subdomains of a domain

Let's be clear, you are not redirecting anything in F5 at this point, all redirects you may receive originate from the end-server. Your iRule is selecting a specific pool, based on the visitors source IP-address. It's all your iRule does.

Now for the Error 404 received when requesting "http://xxx.com/", it is purely related to end-server configuration. If you would like to formulate a maintenance redirect inside F5, have a look at commands

HTTP::respond 302 location "http://www.maintenance.host"

HTTP::redirect "http://www.maintenance.host"

Let's be clear, you are not redirecting anything in F5 at this point, all redirects you may receive originate from the end-server. Your iRule is selecting a specific pool, based on the visitors source IP-address. It's all your iRule does.

Now for the Error 404 received when requesting "http://xxx.com/", it is purely related to end-server configuration. If you would like to formulate a maintenance redirect inside F5, have a look at commands

HTTP::respond 302 location "http://www.maintenance.host"

HTTP::redirect "http://www.maintenance.host"