Are sting operations possible against IPFS→WWW gates?

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No, there are some that are blocked by the gateway.
https://ipfs.io/ipfs/QmcvyefkqQX3PpjpY5L8B2yMd47XrVwAipr6cxUt2zvYU8/The.Big.Lebowski.mp4 - blocked
http://localhost:8080/ipfs/QmcvyefkqQX3PpjpY5L8B2yMd47XrVwAipr6cxUt2zvYU8/The.Big.Lebowski.mp4 - not blocked