簡易HTTPサーバーとして動作するPoweShellスクリプト

http.ps1

$port = 8000
$root = (Get-Location).Path
$listener = [System.Net.HttpListener]::new()

# 権限設定が不要なローカル限定にするなら:
$prefix = "http://localhost:$port/"
# どのIPでも受けたい場合は URLACL 必要:  $prefix = "http://+:$port/"

$listener.Prefixes.Add($prefix)
$listener.Start()
Write-Host "Serving $root at $prefix (Ctrl+C で停止)"

try {
  while ($listener.IsListening) {
    $ctx = $null
    try {
      $ctx = $listener.GetContext()

      $requestPath = $ctx.Request.Url.LocalPath.TrimStart('/')
      if ([string]::IsNullOrWhiteSpace($requestPath)) { $requestPath = 'index.html' }

      $file = Join-Path -Path $root -ChildPath $requestPath

      if (Test-Path -LiteralPath $file -PathType Leaf) {
        $bytes = [System.IO.File]::ReadAllBytes($file)
        $ctx.Response.StatusCode = 200
        # MIME を付けておくとブラウザで開きやすい
        try { $ctx.Response.ContentType = [System.Web.MimeMapping]::GetMimeMapping($file) } catch {}
        $ctx.Response.ContentLength64 = $bytes.Length
        $ctx.Response.OutputStream.Write($bytes, 0, $bytes.Length)
      } else {
        $msg = "Not found: /$requestPath"
        $bytes = [System.Text.Encoding]::UTF8.GetBytes($msg)
        $ctx.Response.StatusCode = 404
        $ctx.Response.ContentType = "text/plain; charset=utf-8"
        $ctx.Response.ContentLength64 = $bytes.Length
        $ctx.Response.OutputStream.Write($bytes, 0, $bytes.Length)
      }
    } catch {
      Write-Warning $_
      if ($ctx -and $ctx.Response) {
        try { $ctx.Response.StatusCode = 500 } catch {}
      }
    } finally {
      if ($ctx -and $ctx.Response) {
        try { $ctx.Response.OutputStream.Close() } catch {}
        try { $ctx.Response.Close() } catch {}
      }
    }
  }
} finally {
  try { $listener.Stop() } catch {}
  try { $listener.Close() } catch {}
}