`Expect-CT` header

[LeoColomb]

Support Certificate Transparency header.

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• Paper: https://httpwg.org/http-extensions/expect-ct.html
• MDN: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect-CT
• CanIUse: https://caniuse.com/#feat=mdn-http_headers_expect-ct

[Malvoz]

FYI the MDN docs now has a note:

The Expect-CT will likely become obsolete in June 2021. Since May 2018 new certificates are expected to support SCTs by default. Certificates before March 2018 were allowed to have a lifetime of 39 months, those will all be expired in June 2021.

Assuming that is correct, perhaps there's little value in adding this header?

[LeoColomb]

@Malvoz Good catch, thanks for that! 👍
What do you suggest? We close issue/pr as almost obsolete?

[Malvoz]

Yes, let's close this. 👍