$ headless-seo-check http://127.0.0.1:4313 -a --json
--- stdout+stderr ---
headless-seo-check: checking http://127.0.0.1:4313 …
headless-seo-check: 4 URLs pointed at another host, checked on 127.0.0.1:4313 instead
headless-seo-check: 4 of 4 URLs selected, from http://127.0.0.1:4313/sitemap.xml
{
  "tool": "headless-seo-check",
  "version": "0.1.0",
  "checked_at_unix": 1786210246,
  "interrupted": false,
  "notes": [],
  "fatal": null,
  "site": "http://127.0.0.1:4313",
  "discovery": {
    "source": "http://127.0.0.1:4313/sitemap.xml",
    "total": 4,
    "checked": 4,
    "rebased": "4 URLs pointed at another host, checked on 127.0.0.1:4313 instead"
  },
  "pages": [
    {
      "url": "http://127.0.0.1:4313/",
      "outcome": "checked",
      "status": 200,
      "ttfb_ms": 0,
      "render_mode": "unclear",
      "words": 309,
      "internal_links": 2,
      "findings": [
        {
          "kind": "render-mode-unclear",
          "severity": "info",
          "message": "rendering mode undetermined — the response headers say nothing about caching",
          "detail": [
            "checked twice, the second response said no more"
          ]
        },
        {
          "kind": "canonical-missing",
          "severity": "warn",
          "message": "no canonical link in the served HTML"
        }
      ]
    },
    {
      "url": "http://127.0.0.1:4313/static/",
      "outcome": "checked",
      "status": 200,
      "ttfb_ms": 0,
      "render_mode": "unclear",
      "words": 309,
      "internal_links": 2,
      "findings": [
        {
          "kind": "render-mode-unclear",
          "severity": "info",
          "message": "rendering mode undetermined — the response headers say nothing about caching",
          "detail": [
            "checked twice, the second response said no more"
          ]
        },
        {
          "kind": "canonical-missing",
          "severity": "warn",
          "message": "no canonical link in the served HTML"
        }
      ]
    },
    {
      "url": "http://127.0.0.1:4313/shell/",
      "outcome": "checked",
      "status": 200,
      "ttfb_ms": 0,
      "render_mode": "unclear",
      "words": 0,
      "internal_links": 0,
      "findings": [
        {
          "kind": "render-mode-unclear",
          "severity": "info",
          "message": "rendering mode undetermined — the response headers say nothing about caching",
          "detail": [
            "checked twice, the second response said no more"
          ]
        },
        {
          "kind": "canonical-missing",
          "severity": "warn",
          "message": "no canonical link in the served HTML"
        },
        {
          "kind": "empty-server-html",
          "severity": "error",
          "message": "the served HTML carries 0 words — Googlebot has to run JavaScript to see this page",
          "detail": [
            "7 <script src> + 4 KB inline JS + an empty root container"
          ]
        },
        {
          "kind": "no-internal-links",
          "severity": "warn",
          "message": "no links to any other page on this host — the navigation is not in the served HTML"
        }
      ]
    },
    {
      "url": "http://127.0.0.1:4313/gone/",
      "outcome": "http-error",
      "status": 404,
      "ttfb_ms": 0,
      "findings": [
        {
          "kind": "sitemap-url-error",
          "severity": "error",
          "message": "HTTP 404 — in your sitemap, but not on your site"
        }
      ]
    }
  ],
  "summary": {
    "checked": 3,
    "dynamic": 0,
    "unclear": 3,
    "noindex_header": 0,
    "hreflang_drift": 0,
    "hreflang_dead_target": 0,
    "empty_html": 1,
    "sitemap_errors": 1,
    "unreachable": 0,
    "blocking": 2
  },
  "warnings": 4,
  "exit_code": 1
}
--- exit code: 1 ---