Security Report Summary
B
Site: https://realpython.com/bonus/python-t-strings-code/
IP Address: 104.20.21.64
Report Time: 08 Oct 2026 14:45:36 UTC
Headers:
  • Referrer-Policy
  • Strict-Transport-Security
  • X-Content-Type-Options
  • X-Frame-Options
  • Content-Security-Policy
  • Permissions-Policy
Advanced:
Solid grade,let’s 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.
Raw Headers
HTTP/2200
dateThu, 08 Oct 2026 14:45:36 GMT
content-typetext/html; charset=utf-8
content-length3656
content-encodinggzip
cross-origin-opener-policysame-origin
nel{"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
referrer-policystrict-origin-when-cross-origin
report-to{"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=I58%2F%2FxpvnDdf2vc62kUdKbfjoBNUW9MGkXopDHZiAlI%3D\u0026sid=67ff5de4-ad2b-4112-9289-cf96be89efed\u0026ts=1791470736"}],"max_age":3600}
reporting-endpointsheroku-nel="https://nel.heroku.com/reports?s=I58%2F%2FxpvnDdf2vc62kUdKbfjoBNUW9MGkXopDHZiAlI%3D&sid=67ff5de4-ad2b-4112-9289-cf96be89efed&ts=1791470736"
servercloudflare
set-cookiecsrftoken=jEsPn4VBCsVVcJX7IsKT4NXT9YXmeWiS; expires=Thu, 07 Oct 2027 14:45:36 GMT; Max-Age=31449600; Path=/; SameSite=Lax; Secure
set-cookieorigin=ref-securityheaders.com; expires=Tue, 03 Jul 2029 14:45:36 GMT; Max-Age=86313600; Path=/
set-cookiecid=911862a78b854d21995c89fa99855a4a; expires=Fri, 08 Oct 2027 14:45:36 GMT; Max-Age=31536000; Path=/
strict-transport-securitymax-age=31536000; includeSubDomains; preload
varyCookie, Accept-Encoding
via2.0 heroku-router
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
cf-cache-statusDYNAMIC
cf-raya475ee26af2dc204-DUB
alt-svch3=":443"; ma=86400
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-Resource-PolicyCross-Origin Resource Policy allows a resource owner to specify who can load the resource.
Additional Information
cross-origin-opener-policyCross-Origin Opener Policy allows a site to opt-in to Cross-Origin Isolation in the browser.
nelNetwork Error Logging is a new header that instructs the browser to send reports during various network or application errors. You can sign up for a free account on Report URI to collect these reports.
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.
report-toReport-To enables the Reporting API. This allows a website to collect reports from the browser about various errors that may occur. You can sign up for a free account on Report URI to collect these reports.
serverServer value has been changed. Typically you will see values like "Microsoft-IIS/8.0" or "nginx 1.7.2".
set-cookieThe 'httpOnly' flag is not set on this cookie. There is no Cookie Prefix on this cookie.
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".
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.