Powershell wait for URL

Powershell wait for URL

function WaitForUrlContent {
	[CmdletBinding()]
	Param (
	    [Parameter(Mandatory=$true)] 
	    [string]$ResponseContentNoPresent,
	
	    [Parameter(Mandatory=$false)] 
	    [string]$Url="http://localhost:4502",

	    [Parameter(Mandatory=$false,
        HelpMessage="Provide Basic Auth Credentials in following format: <user>:<pass>")] 
	    [string]$BasicAuthCreds="",

	    [Parameter(Mandatory=$false)] 
	    [string]$UserAgent="",

	    [Parameter(Mandatory=$false)] 
	    [string]$Referer="",

	    [Parameter(Mandatory=$false)] 
	    [string]$Timeout="5"

	)



    $HEADERS = @{
    }

    if (-not([string]::IsNullOrEmpty($UserAgent))) {
       $HEADERS.add("User-Agent",$UserAgent)
    }

    if (-not([string]::IsNullOrEmpty($Referer))) {
       $HEADERS.add("Referer",$Referer)
    }


    if (-not([string]::IsNullOrEmpty($BasicAuthCreds))) {
       $BASICAUTH = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($BasicAuthCreds))
       $HEADERS.add("Authorization","Basic $BASICAUTH")
    }

    
    Write-Host -NoNewline "Waiting for: $Url"

    $FirstError=$true
    $LastError=""


	while ($true) {
        
        try {
            $response = Invoke-WebRequest -Headers $HEADERS -TimeoutSec $Timeout -Uri "$Url"
            $StatusCode = $Response.StatusCode
        } catch {
            $StatusCode = $_.Exception.Response.StatusCode.value__
            $LastError = $StatusCode
            if ($FirstError -Or $LastError -ne $StatusCode) {
                Write-Host -NoNewline " (Error: $StatusCode)"
                $FirstError=$false
            }
        }

        if( $StatusCode -ne 200 -Or $response.content.contains($ResponseContentNoPresent)) {
            sleep 1
            Write-Host -NoNewline "."
        } else {
            break
        }

	    
	}

}



$SERVER_PATH = "/system/console/bundles.json"

$LOGIN = "admin:admin"
$SERVER_HOST = "localhost"
$PROTOCOL = "http"
$PORT = 4502
$TIMEOUT = 5

$ADDRESS = "${PROTOCOL}://${SERVER_HOST}:${PORT}"

WaitForUrlContent -ResponseContentNoPresent '"state":"Installed"' -Referer $ADDRESS -UserAgent "curl" -Url ${ADDRESS}${SERVER_PATH} -BasicAuthCreds $LOGIN -Timeout $TIMEOUT