Report-ct header?


#1

Hello,

I noticed a (new?) header on cached files:

expect-ct: max-age=604800, report-uri=“https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct

What is it?

Thanks
S.


#2

Hello!

It’s not an extremely new header, but it’s present on everything that passes through Cloudflare and uses their SSL Cert. It’s necessary since browsers require CT (Certificate Transparency) for all certs and they need to monitor errors.

More info:
https://scotthelme.co.uk/a-new-security-header-expect-ct/


#3

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