$ curl -sS -w 
%{http_code} -X GET http://localhost:5173

STDOUT:
<!doctype html>
<html lang="pt-BR">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>AI Agent Frontend</title>
  <link rel="stylesheet" href="styles.css" />
</head>
<body>
  <main class="app">
    <header>
      <h1>AI Agent Platform</h1>
      <p>Frontend independente usando Channel Gateway HTTP + SSE no padrão FIRST.</p>
    </header>
    <section class="config">
      <label>Backend URL <input id="backend" value="http://localhost:8000" /></label>
      <label>Canal
        <select id="channel"><option value="web">web</option><option value="whatsapp">whatsapp</option><option value="voice">voice</option></select>
      </label>
      <label>Session ID <input id="session" placeholder="gerado automaticamente" /></label>
      <label><input id="useSse" type="checkbox" checked /> Usar SSE</label>
      <span id="status">SSE aguardando</span>
    </section>
    <section id="chat" class="chat"></section>
    <form id="form">
      <input id="message" placeholder="Digite sua mensagem..." autocomplete="off" />
      <button>Enviar</button>
    </form>
  </main>
  <script src="app.js"></script>
</body>
</html>

200
STDERR:

DURATION_MS=13
