Header append Public-Key-Pins 'pin-sha256="1XH16wMcwsBfOsMEb/ufcsR0NAtbK028XEWial43Kxc="; pin-sha256="IktlynCPgsYgaFU2bGDbmQQt+xB/e3pqiIWM08Wo6fE="; pin-sha256="GAEdJjO4u7V/FzqxY0uN7SVfMppmk9vCWCwFQYQDXJo="; max-age=300; includeSubdomains'