uni/slides/dhbw-2026/assets/demos/browser-server-sequence.html

<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8">
<title>Browser–Server HTTP Sequenz</title>
<style>
  :root {
    --dark: #1a1a2e;
    --muted: #6b7280;
    --border: #cbd5e1;
    --bg-soft: #f8fafc;
    --hl: #005f8a;
    --req: #2563eb;
    --res: #16a34a;
  }
  html, body { margin: 0; padding: 0; background: #fff; min-height: 100vh; font-family: system-ui, -apple-system, sans-serif; color: var(--dark); }
  body { padding: 24px 32px; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
  h1 { margin: 0 0 4px; font-size: 1.45rem; text-align: center; }
  .sub { color: var(--muted); margin-bottom: 24px; font-size: 0.88rem; text-align: center; }

  .diagram { display: grid; grid-template-columns: 140px 1fr 140px; gap: 0; align-items: start; }

  /* Actors */
  .actor {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    font-weight: 700; font-size: 0.9rem;
  }
  .actor-box {
    border: 2px solid var(--dark); border-radius: 8px;
    padding: 8px 18px; background: var(--bg-soft);
    white-space: nowrap;
  }
  .lifeline {
    width: 2px; background: var(--border);
    height: 100%; min-height: 280px;
    margin: 0 auto;
  }

  /* Messages */
  .messages { display: flex; flex-direction: column; gap: 0; padding-top: 48px; }
  .msg { display: flex; flex-direction: column; margin-bottom: 6px; }
  .msg-arrow {
    display: flex; align-items: center; gap: 0; position: relative;
  }
  .msg-line {
    flex: 1; height: 2px;
  }
  .msg-line.req { background: var(--req); }
  .msg-line.res { background: var(--res); background: repeating-linear-gradient(90deg, var(--res) 0 8px, transparent 8px 13px); }

  .arrowhead-r { width: 0; height: 0; border-top: 6px solid transparent; border-bottom: 6px solid transparent; border-left: 10px solid var(--req); }
  .arrowhead-l { width: 0; height: 0; border-top: 6px solid transparent; border-bottom: 6px solid transparent; border-right: 10px solid var(--res); }

  .msg-label {
    font-size: 0.75rem; font-family: ui-monospace, monospace;
    padding: 2px 0 6px; text-align: center;
  }
  .msg-label.req { color: var(--req); }
  .msg-label.res { color: var(--res); }

  .gap { height: 10px; }

  .legend {
    margin-top: 20px; display: flex; gap: 24px; justify-content: center;
    font-size: 0.82rem;
  }
  .leg { display: flex; align-items: center; gap: 8px; }
  .leg-line { width: 28px; height: 2px; }
  .leg-line.req { background: var(--req); }
  .leg-line.res { background: repeating-linear-gradient(90deg, var(--res) 0 6px, transparent 6px 10px); }
</style>
</head>
<body>
  <h1>Browser–Server: HTTP Kommunikation</h1>
  <p class="sub">Jede Ressource = eigener Request — Browser blockiert nicht, lädt parallel</p>

  <div class="diagram">

    <!-- Browser actor -->
    <div class="actor">
      <div class="actor-box">🌐 Browser</div>
      <div class="lifeline"></div>
    </div>

    <!-- Messages -->
    <div class="messages">

      <div class="msg">
        <div class="msg-arrow"><div class="msg-line req"></div><div class="arrowhead-r"></div></div>
        <div class="msg-label req">GET /products</div>
      </div>
      <div class="msg">
        <div class="msg-arrow"><div class="arrowhead-l"></div><div class="msg-line res"></div></div>
        <div class="msg-label res">HTTP 200 + index.html</div>
      </div>

      <div class="gap"></div>

      <div class="msg">
        <div class="msg-arrow"><div class="msg-line req"></div><div class="arrowhead-r"></div></div>
        <div class="msg-label req">GET /style.css</div>
      </div>
      <div class="msg">
        <div class="msg-arrow"><div class="arrowhead-l"></div><div class="msg-line res"></div></div>
        <div class="msg-label res">HTTP 200 + style.css</div>
      </div>

      <div class="gap"></div>

      <div class="msg">
        <div class="msg-arrow"><div class="msg-line req"></div><div class="arrowhead-r"></div></div>
        <div class="msg-label req">GET /script.js</div>
      </div>
      <div class="msg">
        <div class="msg-arrow"><div class="arrowhead-l"></div><div class="msg-line res"></div></div>
        <div class="msg-label res">HTTP 200 + script.js</div>
      </div>

      <div class="gap"></div>

      <div class="msg">
        <div class="msg-arrow"><div class="msg-line req"></div><div class="arrowhead-r"></div></div>
        <div class="msg-label req">GET /api/products</div>
      </div>
      <div class="msg">
        <div class="msg-arrow"><div class="arrowhead-l"></div><div class="msg-line res"></div></div>
        <div class="msg-label res">HTTP 200 + JSON</div>
      </div>

    </div>

    <!-- Server actor -->
    <div class="actor">
      <div class="actor-box">🖥️ Server</div>
      <div class="lifeline"></div>
    </div>

  </div>

  <div class="legend">
    <div class="leg"><div class="leg-line req"></div><span style="color:var(--req)">Request (Browser → Server)</span></div>
    <div class="leg"><div class="leg-line res"></div><span style="color:var(--res)">Response (Server → Browser)</span></div>
  </div>

</body>
</html>