Shows all the redirects which occur when hitting a given URI. Useful for checking how HTTP301 / HTTP302 / HTTP307 rules are configured. `Hostname` parameter allows us to handle cases where DNS doesn't match the hostname on our listener; useful for testing pre-go-live without updating your hosts file.

Get-HttpUrlRedirects.ps1

function Get-HttpUrlRedirects {
	[CmdletBinding()]
	Param (
		[Parameter(Mandatory)]
		[ValidateNotNullOrEmpty()]
		[string]$Url
		,
		[Parameter()]
		[AllowNull()]
		[AllowEmptyString()]
		[string]$Hostname
	)
	$request = [System.Net.HttpWebRequest][System.Net.WebRequest]::Create($Url)
	if (![string]::IsNullOrWhitespace($Hostname)) {
		$request.Headers.Add("Host",$HostName)
	}
	$request.AllowAutoRedirect = $false
	$request.UseDefaultCredentials = $true
	try {
		$response = $request.GetResponse()
		$statusCode = $response.StatusCode.value__
		([PSCustomObject]@{
			Url = $Url
			StatusCode = $statusCode
		})
		if (($statusCode -ge 300) -and ($statusCode -lt 400)) {
			$redirectUri = $response.Headers['Location']
			$redirectUri = [uri]::new($response.ResponseUri, $redirectUri).AbsoluteUri # ensure we correctly handle relative URIs too
			Write-Verbose "Redirecting to [$redirectUri]"
			Get-HttpUrlRedirects -Url $redirectUri 
		}
	# } catch { # currently non need to catch / handle exceptions... but if there is a requirement this post has more info: https://stackoverflow.com/a/692369/361842
	} finally {
		$response.Dispose()
	}
}