next_protos_parse
if ((protos = next_protos_parse(&protos_len, alpn_server)) == NULL) {
unsigned char *alpn = next_protos_parse(&alpn_len, alpn_client);
unsigned char *next_protos_parse(unsigned short *outlen, const char *in);
alpn = next_protos_parse(&alpn_len, cfg.alpn_in);
alpn_ctx.data = next_protos_parse(&len,