The seriazlied form of ALPN protocol identifier this library
supports. Notice that first byte is the length of following
protocol identifier. This is the same wire format of `TLS ALPN
extension <https://tools.ietf.org/html/rfc7301>`_. This is useful
to process incoming ALPN tokens in wire format.
The seriazlied form of ALPN protocol identifier this library supports. Notice that first byte is the length of following protocol identifier. This is the same wire format of `TLS ALPN extension <https://tools.ietf.org/html/rfc7301>`_. This is useful to process incoming ALPN tokens in wire format.