next_protos_parse
unsigned char *next_protos_parse(size_t *outlen, const char *in);
next_proto.data = next_protos_parse(&next_proto.len, next_proto_neg_in);
unsigned char *alpn = next_protos_parse(&alpn_len, alpn_in);
next_proto.data = next_protos_parse(&next_proto.len, next_proto_neg_in);
alpn_ctx.data = next_protos_parse(&alpn_ctx.len, alpn_in);
unsigned char *alpn = next_protos_parse(&alpn_len, alpn_client);
protos = next_protos_parse(&protos_len, alpn_str);