Security Report Summary
A
Site: https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting/Network_requests
IP Address: 199.232.25.91
Report Time: 08 Oct 2026 21:09:47 UTC
Headers:
  • X-Content-Type-Options
  • Referrer-Policy
  • Strict-Transport-Security
  • X-Frame-Options
  • Content-Security-Policy
  • Permissions-Policy
Advanced:
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Missing Headers
Permissions-PolicyPermissions Policy is a new header that allows a site to control which features and APIs can be used in the browser.
Raw Headers
HTTP/2200
x-content-type-optionsnosniff
expiresThu, 08 Oct 2026 19:34:56 GMT
x-cloud-trace-context6cf34f206ab3dd840b8c62b62f80bb07
x-goog-stored-content-encodingidentity
x-goog-meta-goog-reserved-file-mtime1791421150
last-modifiedThu, 08 Oct 2026 01:16:40 GMT
x-guploader-uploadidAP6rU82NJkmAgjzBHIhxWypNrc1ZcDZopF4ks4HFvb_NYLJGK1kgip7gFg2qlfx5m8PLVXDi
x-goog-metageneration1
referrer-policystrict-origin-when-cross-origin
via1.1 google, 1.1 varnish, 1.1 varnish, 1.1 varnish
x-goog-stored-content-length204377
x-goog-generation1791422200713811
strict-transport-securitymax-age=63072000
x-goog-storage-classSTANDARD
content-typetext/html
x-goog-hashcrc32c=on+A/Q==, md5=BVX33CH/DVC6Mh1FjouMdw==
cache-controlpublic, max-age=3600
etag"0555f7dc21ff0d50ba321d458e8b8c77"
serverGoogle Frontend
x-frame-optionsDENY
content-security-policydefault-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' assets.codepen.io production-assets.codepen.io https://js.stripe.com transcend-cdn.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' assets.codepen.io production-assets.codepen.io https://js.stripe.com transcend-cdn.com 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M=' 'sha256-YCNoU9DNiinACbd8n6UPyB/8vj0kXvhkOni9/06SuYw=' 'sha256-PZjP7OR6mBEtnvXIZfCZ5PuOlxoDF1LDZL8aj8c42rw='; style-src 'report-sample' 'self' 'unsafe-inline' transcend-cdn.com; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net telemetry.transcend.io telemetry.us.transcend.io transcend-cdn.com https://api.github.com/search/issues https://api.stripe.com; font-src 'self'; frame-src 'self' mdn.github.io *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
content-encodinggzip
accept-rangesbytes
age0
dateThu, 08 Oct 2026 21:09:47 GMT
x-served-bycache-par-lfpg1960044-PAR, cache-par-lfpg1960044-PAR, cache-par-lfpg1960062-PAR, cache-dub4365-DUB
x-cacheMISS, HIT, MISS
x-cache-hits0, 2, 0
x-timerS1791493787.870118,VS0,VE195
varyAccept-Encoding
content-length31838
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
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".
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.
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.
serverServer value has been changed. Typically you will see values like "Microsoft-IIS/8.0" or "nginx 1.7.2".
x-frame-optionsX-Frame-Options tells the browser whether you want to allow your site to be framed or not. By preventing a browser from framing your site you can defend against attacks like clickjacking.
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.