2020-12-31 UTC
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Zegnat Please have a look. It seems to only exist in the Grav code to fix specific server setups. https://github.com/getgrav/grav/issues/548 is a bug from 2015 with a discussion spanning multiple years of people having problems with it. And as recently as June this year Grav was still tweaking the header: https://github.com/getgrav/grav/issues/2619