Why is my audio stream in WKWebView on iOS 9 not playing?

Question

I have a WKWebView with content that has an <audio> element pointing to a standard audio stream running on a Shoutcast server that will not play. There are no errors or information in the JavaScript console and no errors in the debugger in Xcode.

Answer 1

The problem turned out to be App Transport Security. This new security feature in iOS 9 was silently preventing the <audio> element from connecting to the insecure audio stream. Allowing arbitrary loads by adding this to my info.plist solved the problem:

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>