request "ping" does Not use Pool, spawning New Agent every interval

[Opensourcecommunitydevelopment]

every Minute you see
Exceed pool maxSockets, creating a new Agent
this happens because the pinginterver

`setInterval(() => {
  let ping = forwardUrl + '?name=' + resolver.hostname;
  request(ping).pipe(devnull());
}, 60 * 1000);`

codepart

i fixed it with following:

setInterval(() => {     
      const http2Req = request({
            url: forwardUrl,
            qs: {
                name: resolver.hostname
                }
          }, (err, response, output) => {
            agentPool.release(http2Req.agent)
              })//.pipe(devnull());
}, 60 * 1000);

needed comment Out Pipe because

``
 { agent: undefined }
.\yyfrankyy\dns-over-http2\index.js:39
      if (tail.agent._spdyState.connection._spdyState.goaway) {
                    ^

TypeError: Cannot read property '_spdyState' of undefined
``

should we still use Pipe here, how?

On Start the first query is slow because delay of Agent Connection waiting created, so do it After init instantly To be ready. I removed Start delay with this:

const ping = function(){
    const http2Req = request({
        url: forwardUrl,
        qs: {
            name: resolver.hostname
            }
      }, (err, response, output) => {
        agentPool.release(http2Req.agent)
          })//.pipe(devnull());
    }
    setInterval(function(){
        ping()
    }, 60 * 1000)
    ping()

Run once started and every Minute As used To before. Opens a ready To use Agent directly. Check Benefit by Compare Response Milliseconds of first query ;-)

[yyfrankyy]

maybe we don't need this ping anymore, or ping with all agents in the pool.