terminateRequest () {
    if (this.pendingRequests.length > 0) {
      const data = this.pendingRequests.shift()
      const hrduration = process.hrtime(data.startTime)
      data.duration = hrduration[0] * 1e3 + hrduration[1] / 1e6
      return data
    }
  }
Terminates the first-in request
This will calculate the request duration, remove it from the queue and return its data