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A comment on Exploiting URL Parser in Programming Languages (2017) [pdf]. Parent comment

Re:Exploiting URL Parser in Programming Languages (2017) [pdf] by jkarneges on Tuesday September 11, 2018 @11:50AM (#17960793)
IPv6: blacklist similar address ranges. Multiple A records: be sure to check against each record before connecting.

Connecting first and then checking the remote IP before sending anything could work I suppose, but I think you'd still need to check against a blacklist.

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