errserve 0.10.0

Servidor de páginas de error para Traefik que devuelve el código de error real
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<!DOCTYPE html>
<html lang="es">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>{{code}} - {{reason}}</title>
  <style>
    :root {
      --bg: #090d16;
      --card-bg: rgba(17, 24, 39, 0.7);
      --border: rgba(255, 255, 255, 0.08);
      --text-main: #f3f4f6;
      --text-muted: #9ca3af;
      --accent-1: #6366f1;
      --accent-2: #a855f7;
      --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }

    body {
      background-color: var(--bg);
      background-image: 
        radial-gradient(at 20% 20%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 80%, rgba(168, 85, 247, 0.12) 0px, transparent 50%);
      color: var(--text-main);
      font-family: var(--font-family);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 1.5rem;
    }

    .card {
      max-width: 520px;
      width: 100%;
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 3rem 2.5rem;
      text-align: center;
      box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    }

    .error-code {
      font-size: clamp(4.5rem, 12vw, 7rem);
      font-weight: 800;
      line-height: 1;
      letter-spacing: -0.04em;
      background: linear-gradient(135deg, #a5b4fc 0%, var(--accent-1) 50%, var(--accent-2) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 0.75rem;
    }

    .error-reason {
      font-size: clamp(1.2rem, 3vw, 1.5rem);
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.75rem;
      letter-spacing: -0.01em;
    }

    .error-description {
      font-size: 0.975rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 2.25rem;
    }

    .actions {
      display: flex;
      gap: 0.85rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.5rem;
      font-size: 0.9rem;
      font-weight: 500;
      border-radius: 10px;
      text-decoration: none;
      transition: all 0.2s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: var(--text-main);
      color: var(--bg);
    }

    .btn-primary:hover {
      opacity: 0.9;
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
      border: 1px solid var(--border);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      transform: translateY(-1px);
    }
  </style>
</head>
<body>

  <main class="card">
    <div class="error-code" id="display-code">{{code}}</div>
    <h1 class="error-reason" id="display-reason">{{reason}}</h1>
    <p class="error-description" id="display-description">{{description}}</p>

    <div class="actions">
      <a href="/" class="btn btn-primary">Ir al Inicio</a>
      <button onclick="history.back()" class="btn btn-secondary">Volver Atrás</button>
    </div>
  </main>

  <script>
    // Fallback dinámico si se abre en local sin pasar por el motor de plantillas Jinja2
    document.addEventListener("DOMContentLoaded", () => {
      const codeEl = document.getElementById("display-code");
      const reasonEl = document.getElementById("display-reason");
      const descEl = document.getElementById("display-description");
      const params = new URLSearchParams(window.location.search);

      if (codeEl.innerText.includes("{{") || codeEl.innerText.trim() === "") {
        codeEl.innerText = params.get("code") || "404";
      }
      if (reasonEl.innerText.includes("{{") || reasonEl.innerText.trim() === "") {
        reasonEl.innerText = params.get("reason") || "Página no encontrada";
      }
      if (descEl.innerText.includes("{{") || descEl.innerText.trim() === "") {
        descEl.innerText = params.get("description") || "La página o el recurso al que intentas acceder no existe o ha sido trasladado.";
      }
    });
  </script>
</body>
</html>