{
 "metric": "security-headers",
 "segment": "gb",
 "anchor": "domain",
 "label": "the UK (domains)",
 "population": "domains in the UK",
 "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": 169,
  "qf_pct": 84.02,
  "ci": [
   77.75,
   88.78
  ],
  "dist": {
   "strong": 15.98,
   "partial": 29.59,
   "missing": 54.44
  },
  "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 58,
   "qf_pct": 77.59,
   "ci": [
    65.34,
    86.41
   ],
   "dist": {
    "strong": 22.41,
    "partial": 12.07,
    "missing": 65.52
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-03",
   "n": 60,
   "qf_pct": 76.67,
   "ci": [
    64.56,
    85.56
   ],
   "dist": {
    "strong": 23.33,
    "partial": 15,
    "missing": 61.67
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-04",
   "n": 167,
   "qf_pct": 83.83,
   "ci": [
    77.5,
    88.64
   ],
   "dist": {
    "strong": 16.17,
    "partial": 29.94,
    "missing": 53.89
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-05",
   "n": 167,
   "qf_pct": 84.43,
   "ci": [
    78.17,
    89.15
   ],
   "dist": {
    "strong": 15.57,
    "partial": 29.94,
    "missing": 54.49
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-06",
   "n": 167,
   "qf_pct": 83.83,
   "ci": [
    77.5,
    88.64
   ],
   "dist": {
    "strong": 16.17,
    "partial": 29.34,
    "missing": 54.49
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-13",
   "n": 169,
   "qf_pct": 84.02,
   "ci": [
    77.75,
    88.78
   ],
   "dist": {
    "strong": 15.98,
    "partial": 29.59,
    "missing": 54.44
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/security-headers/gb"
}