Various ways to handle redirects

PS_Redirects

<#
    try {
        $a = Invoke-WebRequest -Uri $uri -MaximumRedirection 0 -ErrorAction Stop
    }#try_Invoke-WebRequest
    catch {
        #if($_.ErrorDetails.Message -like "*maximum redirection*"){
        if($_.Exception.Message -like "*Moved*"){
            Write-Verbose -Message 'Moved detected.'
            #$result = $a.Headers.Location
            $result = $a.Exception.Response.Headers.Location.AbsoluteUri
        }#if_Error_Moved
        else{
            Write-Warning -Message 'An Error was encountered resolving a potential shortlink:'
            Write-Error $_
        }#else_Error_Moved
    }#catch_Invoke-WebRequest
    return $result
    #>

    <#
    Write-Verbose -Message 'Creating HttpWebRequest'
    $wc = [System.Net.HttpWebRequest]::Create($Uri)
    Write-Verbose -Message 'Created.'
    $wc.AllowAutoRedirect = $false
    try {
        Write-Verbose -Message 'Resolving URI...'
        $response = $wc.GetResponse()
        Write-Verbose -Message 'Resolved.'
        if ($response.Headers["Location"]) {
            Write-Verbose -Message 'Location detected.'
            $Uri = $response.Headers["Location"]
        }#if_location
        else {
            Write-Verbose -Message 'No location detected. Null return.'
            $Uri = $null
        }#else_location
    }#try_HttpWebRequest
    catch {
        Write-Verbose -Message 'Error resolving. Evaluating conditions...'
        if ($_.Exception.InnerException.Response.StatusCode -eq "Moved") {
            Write-Verbose -Message 'Moved detected.'
            $Uri = $_.Exception.InnerException.Response.Headers["Location"]
        }#if_Error_Moved
        else {
            Write-Warning -Message 'An Error was encountered resolving a potential shortlink:'
            Write-Error $_
        }#else_Error_Moved
    }#catch_HttpWebRequest
    return $Uri
    #>
    
    
    <#PSScriptInfo
.VERSION 1.1
.GUID 52a3719b-0d47-402e-a538-9a1623be12f2
.AUTHOR Lee Holmes
.DESCRIPTION Resolve a URI to the URIs it redirects to
#>

<#
.Synopsis
   Resolve a URI to the URIs it redirects to
.EXAMPLE
   PS> Resolve-Uri https://bitly.is/1g3AhR6
   
   https://bitly.is/1g3AhR6
   https://bitly.com/
#>
param(
    ## The URI to resolve
    [Parameter(Mandatory, Position = 0)]
    $Uri
)

$ProgressPreference = "Ignore"
$ErrorActionPreference = "Stop"

while($Uri)
{
    $Uri

    $wc = [System.Net.HttpWebRequest]::Create($Uri)
    $wc.AllowAutoRedirect = $false

    try
    {
        $response = $wc.GetResponse()

        if($response.Headers["Location"])
        {
            $Uri = $response.Headers["Location"]
        }
        else
        {
            $Uri = $null    
        }           
    }
    catch
    {
        if($_.Exception.InnerException.Response.StatusCode -eq "Moved")
        {
            $Uri = $_.Exception.InnerException.Response.Headers["Location"]
        }
        else
        {
            throw $_
        }
    }
}