2020-08-16 UTC
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[schmarty] prologic: it looks like the code that processes all header links was added in the commit you linked above https://github.com/prologic/webmention/commit/701c7fc0f9beaaa129492447724a8a9860daaa0c#diff-bf0e06930b326ef89e8e6d62cb88f22dR129