Invoke-WebRequestEx.ps1

param(
  $Uri,
  $Body,
  $Certificate,
  $CertificateThumbprint,
  $ContentType,
  $Credential,
  $DisableKeepAlive,
  $Headers,
  $InFile,
  $MaximumRedirection,
  $Method,
  $OutFile,
  $PassThru,
  $Proxy,
  $ProxyCredential,
  $ProxyUseDefaultCredentials,
  $SessionVariable,
  $TimeoutSec,
  $TransferEncoding,
  $UseBasicParsing,
  $UseDefaultCredentials,
  $UserAgent,
  $WebSession
)

#Invoke-WebRequest [-Uri] <Uri> [-Body <Object>] [-Certificate <X509Certificate>] [-CertificateThumbprint <String>]
#[-ContentType <String>] [-Credential <PSCredential>] [-DisableKeepAlive] [-Headers <IDictionary>] [-InFile <String>
#] [-MaximumRedirection <Int32>] [-Method <WebRequestMethod>] [-OutFile <String>] [-PassThru] [-Proxy <Uri>] [-Proxy
#Credential <PSCredential>] [-ProxyUseDefaultCredentials] [-SessionVariable <String>] [-TimeoutSec <Int32>] [-Transf
#erEncoding <String>] [-UseBasicParsing] [-UseDefaultCredentials] [-UserAgent <String>] [-WebSession <WebRequestSess
#ion>] [<CommonParameters>]
$savedMaximumRedirection = $PSBoundParameters['MaximumRedirection']
$redirections = 0
$PSBoundParameters['MaximumRedirection']=0
$session = $PSBoundParameters['WebSession']
do {
	$uri = [uri]$PSBoundParameters['Uri']
	$site = $uri.Scheme+'://'+$uri.Authority
	$r = Invoke-WebRequest @PSBoundParameters -ErrorAction SilentlyContinue # to mask maxredirection 'error'
	if (-not $session) { write-host 'no-session'; break; }
	if ($r.StatusCode -eq 302) {
		$redirections++
		if ($redirections -gt $savedMaximumRedirection) {
			break;
		}
		if ($r.Headers['Set-Cookie']) {
			$cookies = $r.Headers['Set-Cookie']
			$paths = $cookies -split '\s*;\s*' | Foreach-Object { if ($_ -match 'path=(.*)') { $matches[1] } } | Sort-Object -Unique
 			foreach ($path in $paths) {
				$session.Cookies.SetCookies($site + $path, $cookies)
			}
		}
		if ($r.Headers['Location'] -match '^/') {
			$PSBoundParameters['Uri'] = $site + $r.Headers['Location']
		}
		else {
			$PSBoundParameters['Uri'] = $r.Headers['Location']
		}
		$PSBoundParameters['Method'] = 'Get'
	}
} until ($r.StatusCode -ne 302)
$r