Security Report Summary
A
Site: https://www.w3.org/Graphics/GIF/spec-gif87.txt
IP Address: 104.18.22.19
Report Time: 08 Oct 2026 02:23:04 UTC
Headers:
  • Strict-Transport-Security
  • Content-Security-Policy
  • X-Content-Type-Options
  • X-Frame-Options
  • Referrer-Policy
  • Permissions-Policy
Advanced:
Great grade! Perform a deeper security analysis of your website and APIs:
Missing Headers
Referrer-PolicyReferrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites.
Permissions-PolicyPermissions Policy is a new header that allows a site to control which features and APIs can be used in the browser.
Warnings
Response is not HTMLThe content-type of the response does not indicate HTML. Not all headers, and therefore the score, may be appropriate.
Raw Headers
HTTP/2200
dateThu, 08 Oct 2026 02:23:04 GMT
content-typetext/plain
content-length9866
last-modifiedTue, 17 Jan 1995 22:19:33 GMT
etag"7ac1-2ced8f50dc740-gzip"
accept-rangesbytes
varyAccept-Encoding
content-encodinggzip
cache-controlpublic, s-maxage=2592001
x-backendwww-mirrors
x-request-ida43b9200b92cdf34
strict-transport-securitymax-age=15552000; includeSubdomains; preload
content-security-policyframe-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests
x-content-type-optionsnosniff
set-cookie__cf_bm=4hfi9DpurPuwOtrYG1p.niqJsFYSFGxe0Bh5XTY_CJc-1791426183.9855258-1.0.1.1-KWrYKe10eOkEuVcMdMvOGVYj8cP_wH0BBi9vZixMWyr6tQ3N0NdlRe3hnPp_jC84tPh.PZ147nOQGcnzaV70D8Qh.1AQa08UXGxeZZQjpsvCRfBo0258_m6b_vgFXSSL; HttpOnly; SameSite=None; Secure; Path=/; Domain=w3.org; Expires=Thu, 08 Oct 2026 02:53:04 GMT
cf-cache-statusHIT
servercloudflare
cf-raya471ae71ec44f54a-DUB
alt-svch3=":443"; ma=86400
X-Frame-OptionsHeader not set, see Additional Information below.
Upcoming Headers
Cross-Origin-Embedder-PolicyCross-Origin Embedder Policy allows a site to prevent assets being loaded that do not grant permission to load them via CORS or CORP.
Cross-Origin-Opener-PolicyCross-Origin Opener Policy allows a site to opt-in to Cross-Origin Isolation in the browser.
Cross-Origin-Resource-PolicyCross-Origin Resource Policy allows a resource owner to specify who can load the resource.
Additional Information
strict-transport-securityHTTP Strict Transport Security is an excellent feature to support on your site and strengthens your implementation of TLS by getting the User Agent to enforce the use of HTTPS.
content-security-policyContent Security Policy is an effective measure to protect your site from XSS attacks. By whitelisting sources of approved content, you can prevent the browser from loading malicious assets. Analyse this policy in more detail. You can sign up for a free account on Report URI to collect reports about problems on your site.
x-content-type-optionsX-Content-Type-Options stops a browser from trying to MIME-sniff the content type and forces it to stick with the declared content-type. The only valid value for this header is "X-Content-Type-Options: nosniff".
serverServer value has been changed. Typically you will see values like "Microsoft-IIS/8.0" or "nginx 1.7.2".
X-Frame-OptionsThe XFO header was not sent but frame-ancestors in Content Security Policy was used instead.