Re: [xhr] Abandon hope of removing sync XHR from the web platform? (#20)

It sounds like the problem is that if `MoPub.AdReceivedSuccess()` is reached it's simply assumed that the previous ad was loaded successfully. Even with all the sync XHR in the world, why would that necessarily be true?

The example is a bit too abstract to give advise about, but in principle it seems straightforward to load ads without sync XHR and only report them as successfully downloaded and rendered when they really are. Can you fill in the blanks for me?

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