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I usually place an app_offline.htm in my root directory when I am releasing a website to a production environment. However sometimes if there has been a few big changes to the site, I would like to click around first to make sure it's stable without allowing access to anyone other than me.
As far as I am aware this isn't possible, but I'm hoping someone has a neat solution...
The solution has to include if someone has a deeplink into the site, so using a default.htm/asp page in the root won't do the trick unfortunately.