Error with a large number of outgoing HTTPS requests?

Question

API

Error #1: TLS: Handshake timeout
Error #2: write: broken pipe

About 20k concurrent connections are being made

var HTTPClient = http.Client{
  Timeout: time.Duration(45 * time.Second),
}

func RequestLongPoll(url string) []byte {
  httpResponse, err := HTTPClient.Get(url)
  if err != nil || httpResponse == nil {
    fmt.Println(err.Error())

    return nil
  }

  defer httpResponse.Body.Close()
  bodyBuffer, err := ioutil.ReadAll(httpResponse.Body)
  if err != nil || bodyBuffer == nil {
    fmt.Println(err.Error())

    return nil
  }

  return bodyBuffer
}

Answer 1

https://stackoverflow.com/questions/32523521/golan...
here is a way to increase TLSHandshakeTimeout

Answer 2

Perhaps the API has a limit on the number of connections from IP?