Especially in our item thumbnails, there's a lot of messiness about what the URL protocol is. There are also some SWF assets whose "URLs" are just saved as paths.
In this change, we start processing all our outputted URLs through a `sanitizeUrl` function, which tries to massage it into an `https://images.neopets.com` URL, and warns if it cannot.
This also warns on some intentionally-different URLs, like our April Fools prank item lol
Anyway, I love functions like this, because the warnings always help me discover the data problems! I wasn't aware of the path-only SWF URLs, for example, until this script started warning about the URL parse errors!
Matchu
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