title: HPKP headers not honored by google chrome 52?
body: <p>My Apache https server has returned the following header as a response for a request to <a href="https://lab20.example.com" rel="nofollow">https://lab20.example.com</a>:</p>
  
  <p>Public-Key-Pins:pin-sha256="klO23nT2ehFDXCfx3eHTDRESMz3asj1muO+4aIdjiuY="; pin-sha256="633lt352PKRXbOwf4xSEa1M517scpD3l5f79xMD9r9Q="; max-age=2592000; includeSubDomains</p>
  
  <p>Those pins are for purpose invalid - but still google chrome 52 allows to connect to my labs. It looks like HPKP is not working. I have also tested:
  chrome://net-internals/#hsts - and after querying lab20.example.com indeed i see HSTS (confirmed working fine) but not HPKP - i do not see any dynamic_spki_hashes. Why ?</p>
  
  <p>Do i need to activate something in chrome in order to be able to understand and process HPKP headers ?</p>
  
  <p>Thanks,</p>