Trusted bidding signals URL does not have to be specified, and the fetches can fail. In those cases, the Chrome implementation will pass in null for the argument, while the current spec didn't really handle them. Null is also passed in when the requested keys are empty, rather than an empty dict.
Trusted bidding signals URL does not have to be specified, and the fetches can fail. In those cases, the Chrome implementation will pass in null for the argument, while the current spec didn't really handle them. Null is also passed in when the requested keys are empty, rather than an empty dict.
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