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This is a good question.

I'm not sure if the browser receives all A/AAAA records from the syscall, or just one. I guess that if the browser has the whole list, and the error is in the 500 range, it could retry a different IP but I'm not sure if browsers do this.




DNS isn’t handled by the kernel, it’s handled by the network library runtime and that does return a list of addresses (I think it actually has you iterate through them in C anyway.)




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