79
SEO audit for cr13.org
cr13 Verlag | Verlag
Health 79/100 (good) · 23 pages crawled · generated 2026-08-26
Download Markdown report (feed to ChatGPT / Claude / Cursor)
23
pages crawled
10
indexable pages
0
errors
63
warnings
141
notices
2
orphan pages
0
broken links
Category breakdown
| Category | Score | Errors | Warnings | Notices |
|---|---|---|---|---|
| Agent Readiness | 84 | 0 | 12 | 16 |
| Performance | 84 | 0 | 12 | 39 |
| Meta Description | 87 | 0 | 10 | 0 |
| Content | 90 | 0 | 8 | 8 |
| Headings | 93 | 0 | 5 | 2 |
| Images | 96 | 0 | 3 | 2 |
| Canonical | 97 | 0 | 2 | 0 |
| Duplicate | 97 | 0 | 2 | 0 |
| Indexability | 97 | 0 | 2 | 0 |
| Links | 97 | 0 | 2 | 12 |
| Sitemap | 97 | 0 | 2 | 0 |
| Budget | 99 | 0 | 1 | 0 |
| Robots | 99 | 0 | 1 | 0 |
| Structured Data | 99 | 0 | 1 | 7 |
| Cache | 100 | 0 | 0 | 11 |
| Crawlability | 100 | 0 | 0 | 1 |
| Security | 100 | 0 | 0 | 12 |
| Social | 100 | 0 | 0 | 20 |
| URL | 100 | 0 | 0 | 11 |
Findings
Warnings (14 rules)
warning Control has no accessible name
Rule agent.control_no_name · Agent Readiness · 12 occurrence(s)
- https://cr13.org/ — 5 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/agb/ — 2 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/author/cr13/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/humanfactor-minibooks/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/impressum/ — 2 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/kasse/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/produkt/buch_0/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/seminare/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/verlag/ — 1 button/link(s) with no text or aria-label — an agent can't target them
- https://cr13.org/warenkorb/ — 1 button/link(s) with no text or aria-label — an agent can't target them
warning Noindex page receives internal links (crawl-budget waste)
Rule budget.noindex_linked · Budget · 1 occurrence(s)
- https://cr13.org/warenkorb/ — this noindex page has 12 internal inlink(s) — Googlebot follows them, fetches the page, then drops it unindexed, spending crawl budget for no indexing benefit (and the links leak equity). Remove/redirect the links, or drop the noindex if the page should be indexed. Linked from: https://cr13.org/, https://cr13.org/verlag/, https://cr13.org/humanfactor-minibooks/.
warning Missing canonical tag
Rule canonical.missing · Canonical · 2 occurrence(s)
warning Thin content (low word count)
Rule content.thin · Content · 8 occurrence(s)
- https://cr13.org/ — 45 words
- https://cr13.org/author/cr13/ — 49 words
- https://cr13.org/humanfactor-minibooks/ — 153 words
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 57 words
- https://cr13.org/produkt/buch_0/ — 105 words
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 81 words
- https://cr13.org/seminare/ — 58 words
- https://cr13.org/verlag/ — 168 words
warning Duplicate <title> across pages
Rule duplicate.title · Duplicate · 2 occurrence(s)
- https://cr13.org/humanfactor-minibooks/ — title shared by 2 pages: https://cr13.org/produkt-kategorie/humanfactor-minibooks/
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — title shared by 2 pages: https://cr13.org/humanfactor-minibooks/
warning Missing <h1>
Rule h1.missing · Headings · 5 occurrence(s)
warning Images missing alt text
Rule images.missing_alt · Images · 3 occurrence(s)
- https://cr13.org/impressum/ — 1 of 3 images missing alt
- https://cr13.org/produkt/buch_0/ — 10 of 13 images missing alt
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 1 of 4 images missing alt
warning Page is noindex
Rule index.noindex · Indexability · 2 occurrence(s)
- https://cr13.org/kasse/ — meta/X-Robots: meta=max-image-preview:large, noindex, follow
- https://cr13.org/warenkorb/ — meta/X-Robots: meta=max-image-preview:large, noindex, follow
warning Orphan page (no internal inlinks)
Rule links.orphan · Links · 2 occurrence(s)
- https://cr13.org/author/cr13/ — no internal links point here
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — no internal links point here
warning Missing meta description
Rule meta_desc.missing · Meta Description · 10 occurrence(s)
- https://cr13.org/
- https://cr13.org/agb/
- https://cr13.org/author/cr13/
- https://cr13.org/humanfactor-minibooks/
- https://cr13.org/impressum/
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/
- https://cr13.org/produkt/buch_0/
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/
- https://cr13.org/seminare/
- https://cr13.org/verlag/
warning Render-blocking script in <head> (no defer/async)
Rule perf.render_blocking · Performance · 12 occurrence(s)
- https://cr13.org/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/agb/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/author/cr13/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/humanfactor-minibooks/ — 9 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/impressum/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/kasse/ — 6 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 9 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/produkt/buch_0/ — 5 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 5 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/seminare/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/verlag/ — 4 render-blocking <script> in <head> (add defer/async or use type=module)
- https://cr13.org/warenkorb/ — 6 render-blocking <script> in <head> (add defer/async or use type=module)
warning robots.txt blocks CSS/JS the pages need to render
Rule robots.blocks_css_js · Robots · 1 occurrence(s)
- https://cr13.org/ — robots.txt Disallow blocks render-critical CSS/JS under: /wp-admin/js/ — Google's renderer can't fetch these, so the affected pages may render blank or thin. Allow the asset path(s) for Googlebot.
warning BreadcrumbList present but structurally incomplete
Rule schema.breadcrumb_incomplete · Structured Data · 1 occurrence(s)
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — a BreadcrumbList is present but structurally incomplete — missing required name. Give itemListElement at least 2 ListItems, each with a sequential integer position and a name, and an item URL on every entry except the last.
warning Non-indexable URL listed in sitemap
Rule sitemap.non_indexable · Sitemap · 2 occurrence(s)
- https://cr13.org/kasse/ — listed in sitemap but noindex
- https://cr13.org/warenkorb/ — listed in sitemap but noindex
Notices (18 rules)
notice Heading levels skip a level
Rule agent.heading_skip · Agent Readiness · 7 occurrence(s)
- https://cr13.org/ — h4 follows h1 — skips h2
- https://cr13.org/author/cr13/ — h4 follows h1 — skips h2
- https://cr13.org/humanfactor-minibooks/ — h4 follows h1 — skips h2
- https://cr13.org/impressum/ — h4 follows h2 — skips h3
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — h4 follows h2 — skips h3
- https://cr13.org/produkt/buch_0/ — h3 follows h1 — skips h2
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — h3 follows h1 — skips h2
notice No llms.txt for AI agents
Rule agent.llms_txt_missing · Agent Readiness · 1 occurrence(s)
- https://cr13.org/ — no llms.txt found at the site root — add one so AI agents get a curated site summary
notice No main landmark for AI agents
Rule agent.no_main_landmark · Agent Readiness · 8 occurrence(s)
- https://cr13.org/agb/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/humanfactor-minibooks/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/impressum/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/produkt/buch_0/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/seminare/ — add a <main> element (or role=main) around the primary content
- https://cr13.org/verlag/ — add a <main> element (or role=main) around the primary content
notice Page served uncached (no-store/private or CDN bypass)
Rule cache.not_cacheable · Cache · 11 occurrence(s)
- https://cr13.org/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/agb/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/author/cr13/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/humanfactor-minibooks/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/impressum/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/kasse/ — Cache-Control: no-cache, must-revalidate, max-age=0, private
- https://cr13.org/produkt/buch_0/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/seminare/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/verlag/ — Cache-Control: max-age=0, no-cache, no-store, must-revalidate
- https://cr13.org/warenkorb/ — Cache-Control: no-cache, must-revalidate, max-age=0, private
notice Low text-to-HTML ratio
Rule content.low_ratio · Content · 8 occurrence(s)
- https://cr13.org/ — 0.3%
- https://cr13.org/author/cr13/ — 0.8%
- https://cr13.org/humanfactor-minibooks/ — 0.7%
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 0.2%
- https://cr13.org/produkt/buch_0/ — 0.4%
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 0.3%
- https://cr13.org/seminare/ — 0.4%
- https://cr13.org/verlag/ — 0.8%
notice Multiple <h1> elements
Rule h1.multiple · Headings · 2 occurrence(s)
- https://cr13.org/ — 4 <h1> elements
- https://cr13.org/humanfactor-minibooks/ — 4 <h1> elements
notice Likely hero image lacks fetchpriority=high
Rule images.hero_no_fetchpriority · Performance · 12 occurrence(s)
- https://cr13.org/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/agb/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/author/cr13/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/humanfactor-minibooks/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/impressum/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/kasse/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/produkt/buch_0/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/seminare/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/verlag/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
- https://cr13.org/warenkorb/ — the likely hero/LCP image (logo_cr13_blau.png) has no fetchpriority="high" — adding it tells the browser to fetch the hero earlier in the waterfall, reducing Largest Contentful Paint. This is a low-severity nudge; verify the flagged image is actually your LCP element.
notice Images without width/height (layout shift / CLS)
Rule images.missing_dimensions · Images · 2 occurrence(s)
- https://cr13.org/impressum/ — 1 of 3 images without width/height
- https://cr13.org/seminare/ — 1 of 3 images without width/height
notice Internal link has no anchor text / accessible name
Rule links.no_anchor_text · Links · 12 occurrence(s)
- https://cr13.org/ — 6 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/agb/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/author/cr13/ — 1 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/humanfactor-minibooks/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/impressum/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/kasse/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 1 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/produkt/buch_0/ — 12 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 3 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/seminare/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/verlag/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
- https://cr13.org/warenkorb/ — 2 internal link(s) have no anchor text, aria-label, or image alt — they pass no keyword signal and are unusable to screen readers. Add descriptive text or an aria-label.
notice Missing Open Graph tags
Rule og.missing · Social · 10 occurrence(s)
- https://cr13.org/ — og:title, og:description, og:image
- https://cr13.org/agb/ — og:title, og:description, og:image
- https://cr13.org/author/cr13/ — og:title, og:description, og:image
- https://cr13.org/humanfactor-minibooks/ — og:title, og:description, og:image
- https://cr13.org/impressum/ — og:title, og:description, og:image
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — og:title, og:description, og:image
- https://cr13.org/produkt/buch_0/ — og:title, og:description, og:image
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — og:title, og:description, og:image
- https://cr13.org/seminare/ — og:title, og:description, og:image
- https://cr13.org/verlag/ — og:title, og:description, og:image
notice Legacy image format (jpg/png/gif) with no next-gen fallback
Rule perf.images_legacy_format · Performance · 12 occurrence(s)
- https://cr13.org/ — 6 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/agb/ — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/author/cr13/ — 1 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/humanfactor-minibooks/ — 5 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/impressum/ — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/kasse/ — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/produkt/buch_0/ — 13 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — 4 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/seminare/ — 3 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/verlag/ — 5 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- https://cr13.org/warenkorb/ — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
notice No ETag header (no conditional GET for unchanged pages)
Rule perf.no_etag · Performance · 12 occurrence(s)
- https://cr13.org/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/agb/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/author/cr13/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/humanfactor-minibooks/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/impressum/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/kasse/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/produkt/buch_0/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/seminare/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/verlag/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
- https://cr13.org/warenkorb/ — the response carries no ETag header — without an ETag (or Last-Modified) there is no cache-revalidation mechanism, so crawlers re-download the full body every visit. Emit an ETag (a content hash) to enable conditional If-None-Match requests.
notice No Last-Modified header (no conditional GET for unchanged pages)
Rule perf.no_last_modified · Performance · 3 occurrence(s)
- https://cr13.org/kasse/ — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- https://cr13.org/warenkorb/ — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
notice URL redirects to another URL
Rule redirect.single · Crawlability · 1 occurrence(s)
- https://cr13.org/kasse/ — redirects to https://cr13.org/warenkorb/
notice No structured data detected
Rule schema.none · Structured Data · 7 occurrence(s)
notice Missing recommended security headers
Rule security.missing_headers · Security · 12 occurrence(s)
- https://cr13.org/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/agb/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/author/cr13/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/humanfactor-minibooks/ — X-Content-Type-Options, HSTS, CSP
- https://cr13.org/impressum/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/kasse/ — HSTS, X-Content-Type-Options
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/ — HSTS, X-Content-Type-Options
- https://cr13.org/produkt/buch_0/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/ — X-Content-Type-Options, HSTS, CSP
- https://cr13.org/seminare/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/verlag/ — HSTS, CSP, X-Content-Type-Options
- https://cr13.org/warenkorb/ — HSTS, X-Content-Type-Options
notice Missing Twitter Card tag
Rule twitter.missing · Social · 10 occurrence(s)
- https://cr13.org/
- https://cr13.org/agb/
- https://cr13.org/author/cr13/
- https://cr13.org/humanfactor-minibooks/
- https://cr13.org/impressum/
- https://cr13.org/produkt-kategorie/humanfactor-minibooks/
- https://cr13.org/produkt/buch_0/
- https://cr13.org/produkt/was-ich-dir-sagen-wollte/
- https://cr13.org/seminare/
- https://cr13.org/verlag/
notice Underscores in URL path (prefer hyphens)
Rule url.underscores · URL · 11 occurrence(s)
- https://cr13.org/produkt/buch_0/
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig-e1606410437526.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig10-e1606410355545.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig2-e1606410429684.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig3-e1606410422961.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig4-e1606410415289.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig5-e1606410407516.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig6-e1606410399922.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig7-e1606410391388.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig8-e1606410383166.jpg
- https://cr13.org/wp-content/uploads/2020/10/buch0_cr13_dasistmirwichtig9-e1606410368570.jpg
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