title: How to properly set HPKP header (Public-Key-Pinning Header)?
body: <p>I am absolutely confused about the header Public-Key-Pinning. How do you add it in Apache?</p>
  
  <p>What I did:<br>
  Took the public key hash from my domain cert, intermediate cert and the root certs separately and added this to apache, mod_headers is enabled. But ssllabs says "No Chain. Check Backup Pins"</p>
  
  <pre>
  Header always set Public-Key-Pins "pin-sha256=\"Root-SSL-Public-Key\"; pin-sha256=\"Intermediate-SSL-Public-Key\"; pin-sha256=\"Domain-SSL-Public-Key\"; max-age=2592000; includeSubDomains"
  </pre>