{
 "metric": "security-headers",
 "segment": "eu",
 "anchor": "domain",
 "label": "the EU (domains)",
 "population": "domains in the EU",
 "states": [
  "strong",
  "partial",
  "missing"
 ],
 "quiet_failure_states": [
  "partial",
  "missing"
 ],
 "measurement": "Tier 3a; check `Strict-Transport-Security`, `Content-Security-Policy`, `X-Frame-Options` on the homepage response. Denominator: `has_web`.",
 "why_it_matters": "HSTS is what stops the first, downgradeable request; CSP is what limits the damage of injected script. Both are one-line changes, and both are commonly switched off silently by a framework upgrade or a proxy change.",
 "limits": null,
 "data_tier": "http_3a",
 "population_predicate": "has_web",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-13",
  "n": 184,
  "qf_pct": 86.41,
  "ci": [
   80.71,
   90.62
  ],
  "dist": {
   "strong": 13.59,
   "partial": 23.37,
   "missing": 63.04
  },
  "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 72,
   "qf_pct": 88.89,
   "ci": [
    79.58,
    94.26
   ],
   "dist": {
    "strong": 11.11,
    "partial": 11.11,
    "missing": 77.78
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-03",
   "n": 74,
   "qf_pct": 81.08,
   "ci": [
    70.71,
    88.38
   ],
   "dist": {
    "strong": 18.92,
    "partial": 12.16,
    "missing": 68.92
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-04",
   "n": 184,
   "qf_pct": 86.41,
   "ci": [
    80.71,
    90.62
   ],
   "dist": {
    "strong": 13.59,
    "partial": 22.83,
    "missing": 63.59
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-05",
   "n": 183,
   "qf_pct": 86.34,
   "ci": [
    80.61,
    90.57
   ],
   "dist": {
    "strong": 13.66,
    "partial": 22.95,
    "missing": 63.39
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-06",
   "n": 184,
   "qf_pct": 84.78,
   "ci": [
    78.89,
    89.26
   ],
   "dist": {
    "strong": 15.22,
    "partial": 21.2,
    "missing": 63.59
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-13",
   "n": 184,
   "qf_pct": 86.41,
   "ci": [
    80.71,
    90.62
   ],
   "dist": {
    "strong": 13.59,
    "partial": 23.37,
    "missing": 63.04
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/security-headers/eu"
}