test-httpsredirect.ps1

[CmdletBinding()]
param(
    [string][Parameter(
        Mandatory = $true,
        ValueFromPipeline = $true
    )]$uri,
    $TimeoutSec = 5
)

process {

    if ($uri.StartsWith([System.Uri]::UriSchemeHttp) -eq $false) {
        $uri = [System.Uri]::UriSchemeHttp + [System.Uri]::SchemeDelimiter + $uri
    }

    [System.Uri]$uri = [System.Uri]$uri
    $expected = [System.Uri]::UriSchemeHttps + [System.Uri]::SchemeDelimiter + $uri.Authority + $uri.PathAndQuery

    if ($uri.Scheme -eq [System.Uri]::UriSchemeHttps) {
        Write-Host -ForegroundColor DarkYellow Selected uri is already on ([System.Uri]::UriSchemeHttps)
        return
    }

    try {
        $response = Invoke-WebRequest -Uri $uri -MaximumRedirection 0 -TimeoutSec $TimeoutSec -ErrorAction Ignore
    }
    catch {
        Write-Host -ForegroundColor Red $_.Exception.Message
        return
    }

    if ($response.Headers.Location -eq $null) {
        Write-Host -ForegroundColor Red "Response from $uri did not return a location http header"
        return
    }

    if ($expected -eq $response.Headers.Location) {
        Write-Host -ForegroundColor Green $uri redirects ($response.StatusCode) to $response.Headers.Location
    }
    else {
        Write-Host -ForegroundColor Red $uri redirects to $response.Headers.Location expected $expected
    }

}