https://mailarchive.ietf.org/arch/msg/websec/cP2TAEGiAee6372DR7zBSWv9wlU/
Re: [websec] #56: Specify includeSubdomains directive for HPKP
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websecspecifydirectivehpkp
https://pekko.apache.org/japi/pekko-http/snapshot/org/apache/pekko/http/scaladsl/model/headers/IncludeSubDomains$.html
IncludeSubDomains$
declaration: package: org.apache.pekko.http.scaladsl.model.headers, class: IncludeSubDomains$