Security Report Summary
C
Site: https://excalidraw.com/
IP Address: 216.150.16.65
Report Time: 28 Oct 2026 05:28:28 UTC
Headers:
  • Referrer-Policy
  • Strict-Transport-Security
  • X-Content-Type-Options
  • Content-Security-Policy
  • X-Frame-Options
  • Permissions-Policy
Warning: Grade capped at A, please see warnings below.
Advanced:
Not bad… Maybe you should perform a deeper security analysis of your website and APIs:
Missing Headers
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.
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. Recommended value "X-Frame-Options: SAMEORIGIN".
Permissions-PolicyPermissions Policy is a new header that allows a site to control which features and APIs can be used in the browser.
Warnings
Referrer-PolicyThe "origin" value is not recommended.
Raw Headers
HTTP/2103
serverVercel
x-vercel-id7UOTmSAEwERYpIraSZwwlXdTUlpb0Zpv
HTTP/2 200
access-control-allow-originhttps://excalidraw.com
age45818
cache-controlpublic, max-age=0, must-revalidate
content-dispositioninline
content-encodinggzip
content-typetext/html; charset=utf-8
dateWed, 28 Oct 2026 05:28:28 GMT
etagW/"0a80f8ac6666eb4968af8c0fb5f332b6"
feature-policy*
last-modifiedTue, 27 Oct 2026 16:44:49 GMT
referrer-policyorigin
serverVercel
strict-transport-securitymax-age=63072000
x-content-type-optionsnosniff
x-vercel-cacheHIT
x-vercel-iddub1::xjkxt-1793165308104-f35e2d915abf
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
serverServer value has been changed. Typically you will see values like "Microsoft-IIS/8.0" or "nginx 1.7.2".
access-control-allow-originThe Access-Control-Allow-Origin header is used to configure CORS.
feature-policyFeature Policy has been renamed to Permissions Policy, see the details here.
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.
serverServer value has been changed. Typically you will see values like "Microsoft-IIS/8.0" or "nginx 1.7.2".
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.
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".