peer.acceptFrame() // ACK
    peer.acceptFrame() // SYN_STREAM
    peer.sendFrame().headers(false, 3, headerEntries("a", "android"))
    for (i in 0..2) {
      // Send frames of summing to size 50, which is windowUpdateThreshold.
      peer.sendFrame().data(false, 3, data(24), 24)
      peer.sendFrame().data(false, 3, data(25), 25)
      peer.sendFrame().data(false, 3, data(1), 1)

Many, many users, but your server is waiting 🕙 for their not-so-good connection to send their requests.

And then waiting 🕙 again for the responses to come back.

This "waiting" 🕙 is measured in microseconds, but still, summing it all, it's a lot of waiting in the end.

That's why it makes a lot of sense to use asynchronous ⏸🔀⏯ code for web APIs.