$vmName = "vm01"
$vm = Get-VM -Name $vmName -ErrorAction Stop
$appurl = "https://www.say-tech.co.jp"
while ($vm.State -eq "Running") {
  $ret = $null
  $ret = Invoke-WebRequest -Uri $appurl -UseBasicParsing -TimeoutSec 10 -ErrorAction SilentlyContinue
  if ($ret -ne $null -and $ret.StatusCode -eq 200) {
       Write-Host "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') app is online   " -ForeGroundColor Green
  } else {
      Write-Host "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') app is Down.     " -ForeGroundColor Red
      Write-Host "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') Restart VM ...   " -ForeGroundColor Red
      #Restart-VM -Name $vm.Name -Force
      #Start-Sleep 60
      $vm |Stop-VM -Force -ErrorAction Stop
      while($vm.Heartbeat -like "Ok*") {
          Start-Sleep -Seconds 1
      }
      $vm |Start-VM -ErrorAction Stop
      Start-Sleep -Seconds 2
      while($vm.Heartbeat -notlike "Ok*") {
          Start-Sleep -Seconds 1
      }
      Write-Host "$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss') VM Restarted."
  }
  Start-Sleep 60
}