Is it safe to add localhost to App Transport Security (ATS) NSExceptionDomains?

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You can now do this for local addresses:

<key>NSAppTransportSecurity</key>    
<dict>
    <key>NSAllowsLocalNetworking</key>
    <true/>
</dict>

Apple has blessed this key as an ATS exception — it has said it will not reject apps for using it. More info here: https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html (search in page for “local”)

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