Capability systems can turn authorization decisions into parsing decisions, points out Nathaniel Filardo. #SP16
you probably need semantic checks here anyway (no localhost etc); on the parser side you only need to look for digits and dots
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ofc in a real world system it's more complex: cases like one-off script vs legacy vs you get to design it from the ground up
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keeping authorization in a parsing decision helps to make it state-independent though, that may be useful in cases
End of conversation
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