Compare HTML fetched by the Invoke-WebRequest command with each other.

Compare-WebResponse.ps1

function Get-HtmlContent($url)
{
  Invoke-WebRequest $url `
  | Select-Object -ExpandProperty Content `
  | ForEach-Object {$_.Split([Environment]::NewLine, [StringSplitOptions]::RemoveEmptyEntries)}
}

function Compare-WebResponse($url1, $url2) {
  $html1 = Get-HtmlContent $url1
  $html2 = Get-HtmlContent $url2
  Compare-Object $html1 $html2
}

### Example ###
$hasDiff = Compare-WebResponse "https://example.com/foo" "https://example.com/bar"
if ($hasDiff) {
  echo "Has defference."
}
else {
  echo "No defference."
}