agu.st
Grade A+ · 100/100 · 6/7 security headers present
Security Score
Security Headers
CSP Violations
Issues Found
Recommendations
Security
100 / 100Excellent security posture with strong CSP protections in place.
Compliance
90 / 100CSP implementation follows recommended standards and specifications.
Best Practices
63 / 100Basic practices followed but missing important optimizations.
CSP Analysis
default-src 'none';script-src 'self';frame-src 'self';style-src 'self';img-src 'self';font-src 'self';connect-src 'self';object-src 'none';base-uri 'none';frame-ancestors 'none';form-action 'self';upgrade-insecure-requests;
Directive Analysis
Security Headers
Isolates the browsing context to prevent Spectre-type side-channel attacks and cross-origin window manipulation.
How to add it:
add_header Cross-Origin-Opener-Policy "same-origin" always;Header always set Cross-Origin-Opener-Policy "same-origin"Rules > Transform Rules > HTTP Response Header Modification > Set Cross-Origin-Opener-Policy to "same-origin"camera=(), microphone=(), geolocation=()
Restricts which browser features (camera, microphone, geolocation) the page can use, limiting attack surface.
strict-origin-when-cross-origin
Controls how much referrer information is sent with requests, preventing data leaks to third parties.
max-age=31536000; includeSubDomains; preload
Forces browsers to use HTTPS for all future requests, preventing man-in-the-middle attacks and SSL stripping.
nosniff
Prevents browsers from MIME-sniffing responses away from the declared Content-Type, blocking drive-by downloads.
DENY
Prevents the page from being embedded in iframes, protecting against clickjacking attacks.
0
Legacy XSS filter for older browsers. Modern browsers use CSP instead. Set to "0" to avoid false positives.
1 recommended security header is missing on agu.st.
Issues Found
- •Missing security header: Cross-Origin-Opener-Policymedium
- •No nonces or hashes used for script-srcmedium
Recommendations
- →Review and tighten source lists in Content Security Policy
Beyond headers: infrastructure exposure
via OSN, our sister projectSecurity headers protect the browser. OSN maps what's exposed underneath — servers, open ports, known CVEs, DNS and WHOIS.
agu.st
2 scans since 9/11/2026
Latest: 100/100
Total Scans
2
Latest Score
100/100
First Scan
9/11/2026
Last Scan
9/13/2026
Security
100 / 100Excellent security posture with strong CSP protections in place.
Compliance
90 / 100CSP implementation follows recommended standards and specifications.
Best Practices
63 / 100Basic practices followed but missing important optimizations.
Score Trend
Security score progression over 2 scans
Show off your security grade
Embed this badge on your site or README. It updates automatically after each scan and links back to this report.
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<img src="https://headertest.com/api/badge/agu.st" alt="HeaderTest security grade: A+ (100/100) for agu.st" />
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