[1] RFC 8292 - Voluntary Application Server Identification (VAPID) for Web Push () https://tools.ietf.org/html/rfc8292#section-3.2
[2] RFC 8291 - Message Encryption for Web Push () https://tools.ietf.org/html/rfc8291#section-4
[3] RFC 3279 - Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile () https://tools.ietf.org/html/rfc3279#section-2.3.5