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Clears handlers to avoid memory leaks.
Arguments:
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Wrap the image callback with debug and cleanup logic.
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Test loading the given image.
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Test loading the given image, retrying if necessary.
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Pings the network with an image URI to check if an error is a server error
or user's network error.
The caller needs to add a 'rand' parameter to make sure the response is
not fulfilled by browser cache.
Arguments:
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