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      <h1 style="font-size: 1.6rem; margin-bottom: 0.3rem;">HTTP Status Code Reference & Diagnostic Guide</h1>
      <p style="font-size: 0.88rem;">Look up HTTP response status codes (1xx-5xx), RFC 9110 specifications, causes, resolution steps, and sample response headers 100% client-side.</p>
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      <h2>HTTP Status Codes: RFC 9110 Semantics, Redirection Classes & Server Diagnostics</h2>
      <p>HTTP status codes indicate the result of a client request using 3-digit integers categorized into five distinct classes (1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, and 5xx Server Error) governed by RFC 9110.</p>

      <h3>Infrastructure Parameters &amp; Protocol Matrix</h3>
      <table>
        <thead>
          <tr><th>Directive / Configuration Key</th><th>Production Bound &amp; Recommended Setting</th></tr>
        </thead>
        <tbody>
          <tr><td><strong>HTTP Specification</strong></td><td>IETF RFC 9110: HTTP Semantics (Replaces RFC 7231 / RFC 2616)</td></tr>
          <tr><td><strong>Class Hierarchy</strong></td><td>1xx (Info), 2xx (Success), 3xx (Redirect), 4xx (Client), 5xx (Server)</td></tr>
          <tr><td><strong>Redirect Semantics</strong></td><td>301/302 (May change POST to GET) vs 307/308 (Method Preserving)</td></tr>
          <tr><td><strong>Caching Behavior</strong></td><td>Heuristically cacheable codes (200, 204, 301, 404, 410, 501)</td></tr>
        </tbody>
      </table>

      <h3>Production Deployment &amp; Reliability Checklist</h3>
      <ul>
        <li><strong>Configuration Idempotency:</strong> Validate declarative manifests with dry-run flags (e.g. <code>--dry-run=client</code>) before applying changes to live cloud infrastructure.</li>
        <li><strong>Boundary &amp; Subnet Isolation:</strong> Enforce strict CIDR subnet masking and port isolation to prevent unintended exposure of internal management ports.</li>
        <li><strong>Graceful Shutdown &amp; Signal Trapping:</strong> Configure container runtimes with appropriate termination grace periods (SIGTERM traps) to allow active TCP connections to drain cleanly.</li>
        <li><strong>Strict Schema &amp; Type Contracts:</strong> Establish automated serialization contract testing between producer and consumer services to prevent breaking structural changes during schema migrations.</li>
      </ul>

      <h3>Infrastructure Configuration &amp; Command Examples</h3>
      <h4>Node.js (HTTP Response Handler)</h4>
      <pre><code>import http from 'http';

const server = http.createServer((req, res) => {
  if (req.url === '/api/data') {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ status: 'ok' }));
  } else {
    res.writeHead(404, { 'Content-Type': 'text/plain' });
    res.end('Resource Not Found');
  }
});</code></pre>
      <h4>cURL Status Code Extraction</h4>
      <pre><code># Print only the HTTP status code
curl -s -o /dev/null -w "%{http_code}\n" https://quickdevbox.com</code></pre>

      <h3>Production Pipeline Automation &amp; Configuration Hygiene</h3>
      <p>Managing modern infrastructure manifests requires automated linting, schema validation, and strict environment parity across development, staging, and production clusters. Integrate declarative validation utilities (such as <code>yamllint</code>, <code>kubeconform</code>, or <code>shellcheck</code>) directly into CI/CD pipelines to intercept syntax regressions before provisioning cloud resources. Never commit static authentication credentials into repository manifests; leverage dynamic secret injection, scoped service accounts, and GitOps synchronization controllers to guarantee immutable delivery. Establish automated canary deployments with metric-based auto-rollback triggers to prevent faulty infrastructure rollouts.</p>

      <h3>Official IETF RFCs &amp; Systems Standards</h3>
      <ul>
        <li><a href="https://datatracker.ietf.org/doc/html/rfc9110" target="_blank" rel="noopener noreferrer">IETF RFC 9110: HTTP Semantics</a></li>
        <li><a href="https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml" target="_blank" rel="noopener noreferrer">IANA Hypertext Transfer Protocol (HTTP) Status Code Registry</a></li>
      </ul>
    </article>

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          <div class="desc">Create basic auth password hashes.</div>
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      "503": { name: "Service Unavailable", cat: "5xx Server Error", desc: "The server cannot handle the request (overloaded or down for maintenance)." },
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