add_header Public-Key-Pins 'pin-sha256="X3pGTSOuJeEVw989IJ/cEtXUEmy52zs1TZQrU06KUKg="; \
pin-sha256="MHJYVThihUrJcxW6wcqyOISTXIsInsdj3xK8QrZbHec="; \
pin-sha256="isi41AizREkLvvft0IRW4u3XMFR2Yg7bvrF7padyCJg="; \
max-age=10' always;