Mirror from crawlcheck.io 2026-10-21T16:00Z

README.md

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+---
+license: cc-by-4.0
+pretty_name: "CrawlCheck Finding counts by problem"
+language:
+- en
+tags:
+- technical-seo
+- website-findings
+- web-measurement
+- crawlcheck
+---
+
+# CrawlCheck: Finding counts by problem
+
+How many measured sites carry each problem the scan can raise, by lane and tier, plus finding frequencies across every scan run.
+
+Mirrored from [crawlcheck.io/datasets/problems](https://crawlcheck.io/datasets/problems) by the CrawlCheck Worker; the site is the canonical copy and is updated first. Measured by CrawlCheck's own observer. Free under CC BY 4.0: credit "CrawlCheck" with the URL of the file.
+
+- Catalogue of every dataset: https://crawlcheck.io/datasets
+- How the data is made: https://crawlcheck.io/how-it-works

counts.json

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+{"ok":true,"at":"2026-10-21T16:00:38.828Z","sites_measured":366762,"scans_run":4169,"domains_in_corpus":526649,"sites_measured_truncated":false,"sites_measured_counted_at":"2026-10-21T15:21:20.083Z","sites_measured_source":"hourly count","crawler_visits":210774,"queue":277960,"identities_sent":15,"sections":38,"sections_scored":24,"findings_published":98,"guides_published":67,"note":"Counts as this Worker holds them at the moment of the request. Cached 60 seconds upstream; safe to poll."}

problems.json

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+{"ok":true,"kind":"crawlcheck-dataset-problems","v":1,"updated":"2026-10-21T15:49:57.728Z","days":["2026-10-21","2026-10-20","2026-10-19","2026-10-18","2026-10-17","2026-10-16","2026-10-15"],"tiers":[{"up_to_sites":1000,"price":99},{"up_to_sites":10000,"price":199},{"up_to_sites":null,"price":299}],"problems":[{"code":"CSP_REPORTING_BROKEN","title":"CSP violation reporting is misconfigured","source":"daily dataset","sites":49,"price":99,"page":"https://crawlcheck.io/datasets/problems/csp-reporting-broken"},{"code":"HSTS_MISSING","title":"HTTPS is served without a Strict-Transport-Security header","source":"daily dataset","sites":31684,"price":299,"page":"https://crawlcheck.io/datasets/problems/hsts-missing"},{"code":"HSTS_PRELOAD_INELIGIBLE","title":"The HSTS header asks for browser preloading but does not qualify for it","source":"daily dataset","sites":1724,"price":199,"page":"https://crawlcheck.io/datasets/problems/hsts-preload-ineligible"},{"code":"CONTENT_NEEDS_JAVASCRIPT","title":"The page’s content only exists after JavaScript runs","source":"full scans","sites":1,"price":99,"page":"https://crawlcheck.io/datasets/problems/content-needs-javascript"},{"code":"SITEMAP_NO_LASTMOD","title":"The sitemap does not say when anything changed","source":"daily dataset","sites":5500,"price":199,"page":"https://crawlcheck.io/datasets/problems/sitemap-no-lastmod"},{"code":"BROKEN_INTERNAL_LINK","title":"Links on this site point at pages that do not answer","source":"daily dataset","sites":6814,"price":199,"page":"https://crawlcheck.io/datasets/problems/broken-internal-link"},{"code":"SCRIPT_ONLY_LINKS","title":"Some pages can only be reached by a click handler, not a link","source":"daily dataset","sites":231,"price":99,"page":"https://crawlcheck.io/datasets/problems/script-only-links"},{"code":"FORM_ONLY_CONTENT","title":"Some listings can only be reached by filling in a form","source":"daily dataset","sites":29,"price":99,"page":"https://crawlcheck.io/datasets/problems/form-only-content"},{"code":"FRONTIER_BLOAT","title":"Links send crawlers to the same pages under many different addresses","source":"daily dataset","sites":427,"price":99,"page":"https://crawlcheck.io/datasets/problems/frontier-bloat"},{"code":"SCANNER_REFUSED_BROWSER_READ","title":"The site refuses plain automated requests; it was measured through a real browser","source":"daily dataset","sites":25,"price":99,"page":"https://crawlcheck.io/datasets/problems/scanner-refused-browser-read"},{"code":"BROKEN_EMBED","title":"An embedded frame on the homepage cannot load","source":"daily dataset","sites":441,"price":99,"page":"https://crawlcheck.io/datasets/problems/broken-embed"},{"code":"IMAGES_BLOCKED_GOOGLEBOT_IMAGE","title":"robots.txt keeps Google's image crawler off the site's images","source":"daily dataset","sites":1535,"price":199,"page":"https://crawlcheck.io/datasets/problems/images-blocked-googlebot-image"},{"code":"IMAGE_FORMAT_MISMATCH","title":"Images are not the format their file names say","source":"daily dataset","sites":3152,"price":199,"page":"https://crawlcheck.io/datasets/problems/image-format-mismatch"},{"code":"REDIRECT_CHAIN","title":"The homepage is reached through a chain of redirects","source":"daily dataset","sites":29341,"price":299,"page":"https://crawlcheck.io/datasets/problems/redirect-chain"},{"code":"HOST_DUPLICATE_200","title":"www and the apex both serve the site instead of one redirecting","source":"daily dataset","sites":7597,"price":199,"page":"https://crawlcheck.io/datasets/problems/host-duplicate-200"},{"code":"ROBOTS_RULES_SHADOWED","title":"robots.txt rules do not apply to named agents","source":"daily dataset","sites":7208,"price":199,"page":"https://crawlcheck.io/datasets/problems/robots-rules-shadowed"},{"code":"INSTRUCTION_CONFLICT","title":"The instruction files contradict each other","source":"daily dataset","sites":292,"price":99,"page":"https://crawlcheck.io/datasets/problems/instruction-conflict"},{"code":"MACHINE_CHAIN_HEAVY","title":"The machine files cost more than the page","source":"full scans","sites":2,"price":99,"page":"https://crawlcheck.io/datasets/problems/machine-chain-heavy"},{"code":"UNIFORM_REFUSAL","title":"This origin refused CrawlCheck, so the site was never measured","source":"daily dataset","sites":1887,"price":199,"page":"https://crawlcheck.io/datasets/problems/uniform-refusal"},{"code":"ORIGIN_REFUSED_SCANNER","title":"The homepage and robots.txt both refused this client, so the site was never measured","source":"daily dataset","sites":1,"price":99,"page":"https://crawlcheck.io/datasets/problems/origin-refused-scanner"},{"code":"MACHINE_FILE_CACHE_SPLIT","title":"This file answers differently depending on whether the cache is hit","source":"daily dataset","sites":22,"price":99,"page":"https://crawlcheck.io/datasets/problems/machine-file-cache-split"},{"code":"MACHINE_FILE_CACHE_STALE","title":"The cache is still serving a file the origin no longer has","source":"daily dataset","sites":242,"price":99,"page":"https://crawlcheck.io/datasets/problems/machine-file-cache-stale"},{"code":"CHALLENGE_SERVED_200","title":"A verification page is being served instead of the file","source":"daily dataset","sites":49,"price":99,"page":"https://crawlcheck.io/datasets/problems/challenge-served-200"},{"code":"PAGE_IS_MOSTLY_CODE","title":"Almost nothing a machine receives from this page is readable text","source":"full scans","sites":1,"price":99,"page":"https://crawlcheck.io/datasets/problems/page-is-mostly-code"},{"code":"STALE_CACHE_SERVED","title":"Visitors and crawlers are being served an old copy of this page","source":"full scans","sites":2,"price":99,"page":"https://crawlcheck.io/datasets/problems/stale-cache-served"},{"code":"CHALLENGE_PINNED_AT_EDGE","title":"The verification page is cached at the CDN edge","source":"daily dataset","sites":1,"price":99,"page":"https://crawlcheck.io/datasets/problems/challenge-pinned-at-edge"},{"code":"ROBOTS_IS_HTML","title":"robots.txt is HTML, not text","source":"daily dataset","sites":323,"price":99,"page":"https://crawlcheck.io/datasets/problems/robots-is-html"},{"code":"ROBOTS_IS_CATCHALL","title":"robots.txt answers with the catch-all page - there is no robots.txt","source":"daily dataset","sites":3468,"price":199,"page":"https://crawlcheck.io/datasets/problems/robots-is-catchall"},{"code":"ROBOTS_BLOCKED","title":"robots.txt is unreadable","source":"daily dataset","sites":334,"price":99,"page":"https://crawlcheck.io/datasets/problems/robots-blocked"},{"code":"ROBOTS_DISALLOW_ALL","title":"robots.txt blocks every crawler it does not name","source":"daily dataset","sites":1342,"price":199,"page":"https://crawlcheck.io/datasets/problems/robots-disallow-all"},{"code":"SITEMAP_IS_HTML","title":"The sitemap returns HTML, not XML","source":"daily dataset","sites":230,"price":99,"page":"https://crawlcheck.io/datasets/problems/sitemap-is-html"},{"code":"SITEMAP_BLOCKED","title":"The sitemap is refused","source":"daily dataset","sites":2351,"price":199,"page":"https://crawlcheck.io/datasets/problems/sitemap-blocked"},{"code":"SITEMAP_ORIGIN_ERROR","title":"The origin returned a server error on the sitemap path","source":"daily dataset","sites":402,"price":99,"page":"https://crawlcheck.io/datasets/problems/sitemap-origin-error"},{"code":"HOMEPAGE_REFUSED","title":"The homepage refused this client, so every homepage section is unmeasured","source":"daily dataset","sites":285,"price":99,"page":"https://crawlcheck.io/datasets/problems/homepage-refused"},{"code":"HOMEPAGE_IS_INTERSTITIAL","title":"The homepage answered with an interstitial, not a page","source":"daily dataset","sites":88,"price":99,"page":"https://crawlcheck.io/datasets/problems/homepage-is-interstitial"},{"code":"SITEMAP_UNREADABLE","title":"Whether a sitemap exists could not be determined — every path was refused","source":"daily dataset","sites":816,"price":99,"page":"https://crawlcheck.io/datasets/problems/sitemap-unreadable"},{"code":"DECLARED_SITEMAP_REFUSED","title":"The sitemap robots.txt declares refused this client","source":"daily dataset","sites":131,"price":99,"page":"https://crawlcheck.io/datasets/problems/declared-sitemap-refused"},{"code":"ORIGIN_BLOCKED_BEHIND_CACHE","title":"A security layer refused this file — source unconfirmed","source":"daily dataset","sites":30,"price":99,"page":"https://crawlcheck.io/datasets/problems/origin-blocked-behind-cache"},{"code":"DECLARED_SITEMAP_BROKEN","title":"robots.txt points at a sitemap that fails","source":"daily dataset","sites":798,"price":99,"page":"https://crawlcheck.io/datasets/problems/declared-sitemap-broken"},{"code":"NO_SITEMAP_FOUND","title":"No XML sitemap found","source":"daily dataset","sites":18279,"price":299,"page":"https://crawlcheck.io/datasets/problems/no-sitemap-found"},{"code":"ROBOTS_NOT_200","title":"robots.txt does not return 200","source":"daily dataset","sites":8260,"price":199,"page":"https://crawlcheck.io/datasets/problems/robots-not-200"},{"code":"ROBOTS_NO_SITEMAP","title":"robots.txt declares no sitemap","source":"daily dataset","sites":18565,"price":299,"page":"https://crawlcheck.io/datasets/problems/robots-no-sitemap"},{"code":"AI_OPTOUT_SET","title":"An AI opt-out signal is set","source":"daily dataset","sites":37,"price":99,"page":"https://crawlcheck.io/datasets/problems/ai-optout-set"},{"code":"STAGING_LEAK","title":"A staging hostname is exposed in the page source","source":"daily dataset","sites":186,"price":99,"page":"https://crawlcheck.io/datasets/problems/staging-leak"},{"code":"ROBOTS_CTYPE","title":"robots.txt has an unexpected content type","source":"daily dataset","sites":293,"price":99,"page":"https://crawlcheck.io/datasets/problems/robots-ctype"},{"code":"NO_LLMS_TXT","title":"No llms.txt","source":"daily dataset","sites":53873,"price":299,"page":"https://crawlcheck.io/datasets/problems/no-llms-txt"}],"full_scan_only":[{"code":"HSTS_PRELOAD_REMOVED","title":"This domain was removed from the browser HSTS preload list","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"AD_DENSITY_HIGH","title":"Ads take too much of the page on a phone","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"MOBILE_INTERSTITIAL","title":"A pop-up covers the page on a phone when it loads","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"DATE_MOVED_NO_CHANGE","title":"The page's date changed but its words did not","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"PHONE_SHARED_BY_OTHER_BUSINESSES","title":"Directories list this phone number for other businesses","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"PAGES_SNIPPET_RESTRICTED","title":"Pages meant to be found hide their own search snippet","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"PLACEHOLDER_CONTENT","title":"Unfinished placeholder text is live on this page","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"ANSWER_ENGINE_REFUSED","title":"An answer engine's crawler was refused while a browser was served","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"CRAWLER_SERVED_LESS","title":"A named crawler was served materially less text than an ordinary client","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"CRAWLER_REDIRECTED_AWAY","title":"A named crawler was sent somewhere the ordinary client was not","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"DOMAIN_IS_ALIAS","title":"This domain is an alias: every path redirects to another site","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"HOMEPAGE_REDIRECTS_OFF_HOST","title":"The homepage sends crawlers to a different hostname","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"SITEMAP_DECLARES_NOTHING","title":"A sitemap answers 200 and lists nothing","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"ENTITY_COLLISION","title":"Two different entities share the same identifying data","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"ENTITY_NO_COORDINATES","title":"An entity is missing geographic coordinates","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"},{"code":"GEO_COUNTRY_MISMATCH","title":"Published coordinates are not in the country the address names","sites":null,"for_sale":false,"why":"found only by a full scan of a site; no full scan in the last 7 days has found it yet, so there is no list"}]}