void nghttp2_put_uint16be(uint8_t *buf, uint16_t n) {
  uint16_t x = htons(n);
  memcpy(buf, &x, sizeof(uint16_t));
}
void nghttp2_put_uint16be(uint8_t *buf, uint16_t n) {
  uint16_t x = htons(n);
  memcpy(buf, &x, sizeof(uint16_t));
}