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fastapi-sse
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<!DOCTYPE html>
<html>
<head>
  <title>Minimalistic SSE Frontend</title>
  <meta> </meta>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f0f0f0;
      margin: 0;
      padding: 0;
      text-align: center;
    }

    h1 {
      background-color: #333;
      color: #fff;
      padding: 10px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    th, td {
      padding: 10px;
      text-align: left;
    }

    th {
      background-color: #333;
      color: #fff;
    }

    tr:nth-child(even) {
      background-color: #f2f2f2;
    }
  </style>
</head>
<body>
  <h1>Server-Sent Events</h1>
  <table>
    <thead>
      <tr>
        <th>Event ID</th>
        <th>Message</th>
        <th>Date & Time</th>
        <th>Delay(ms)</th>
      </tr>
    </thead>
    <tbody id="data-list"></tbody>
  </table>

  <script>
    const dataList = document.getElementById('data-list');
    const eventSource = new EventSource('/stream');
    eventSource.addEventListener('new_message', event => {
      const { message, datetime } = JSON.parse(event.data);
      const row = document.createElement('tr');
      const tr = new Date(datetime);
      const tn = new Date(Date.now());
      const delay = (tn - tr);
      row.innerHTML = `<td>${event.lastEventId}</td><td>${message}</td><td>${datetime}</td><td>${delay}</td>`;
      dataList.appendChild(row);
    });
  </script>
</body>
</html>