Security Report Summary
R
Redirect: Click here to follow the redirect to https://proton.me/mail.
Site: https://protonmail.ch/
IP Address: 185.70.42.21
Report Time: 30 Apr 2025 10:52:25 UTC
Headers:
  • Strict-Transport-Security
  • X-Frame-Options
  • X-Content-Type-Options
  • Referrer-Policy
  • Content-Security-Policy
  • Permissions-Policy
Advanced:
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.
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/1.1301 Moved Permanently
content-length0
locationhttps://proton.me/mail
strict-transport-securitymax-age=31536000; includeSubDomains; preload
public-key-pins-report-onlypin-sha256="8joiNBdqaYiQpKskgtkJsqRxF7zN0C0aqfi8DacknnI="; pin-sha256="drtmcR2kFkM8qJClsuWgUzxgBkePfRCkRpqUesyDmeE="; report-uri="https://reports.proton.me/reports/tls"
x-frame-optionsdeny
x-content-type-optionsnosniff
x-xss-protection0
referrer-policystrict-origin-when-cross-origin
x-permitted-cross-domain-policiesnone
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.
public-key-pins-report-onlyHTTP Public Key Pinning Report Only allows a host to test the effects of a HPKP policy before making it live. The browser will report on actions that would have been taken if the policy were live so a host can see what effect it would have. Analyse this policy in more detail.
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.
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".
x-xss-protectionX-XSS-Protection sets the configuration for the XSS Auditor built into older browsers. The recommended value was "X-XSS-Protection: 1; mode=block" but you should now look at Content Security Policy instead.
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.