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Use Weblock – AdBlock for iOS app to create a redirect rule from http://app
to the IP and port you like.
(Only works when on a WIFI network)
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Install the App Weblock from the App Store. Then configure as per instruction in the app.
You must include the protocol and the domain and also a wildcard character at the end.
If you don’t include a wildcard character the images and other parts of your site will not load as there isn’t a redirect rule them.
Here’s what the redirect value should look like.
http://mysite/*
Creds:
http://apple.stackexchange.com/questions/17077/add-a-hosts-file-entry-without-jailbreaking