wait-websiteup.ps1

function wait-websiteup($testUrl, $timeoutSeconds){
    $webClient = new-object System.Net.WebClient
    $webClient.Headers.Add(“user-agent”, “PowerShell Script”)


    $startTime = get-date
        while (1 -eq 1) {
           $output = “”

            try{
                $output = $webClient.DownloadString($testUrl)
            } catch {
                Write-Warning "Waiting..."
            }
           $endTime = get-date


           $s = ($endTime – $startTime).TotalSeconds

           if($s -gt $timeoutSeconds){
            Write-Error "Timed out waiting for $testUrl"
            break
           }

           if( -not [string]::IsNullOrWhiteSpace($output) ){
            Write-verbose "Site Up $testUrl" -Verbose
            break
           }


           Start-Sleep -Seconds 3
        }
}