# BeaverCheck Audit Report — https://keio.ac.jp **Date:** April 22, 2026 **URL:** https://keio.ac.jp **Overall Grade:** C (72/100) **Report:** https://beavercheck.com/results/2d5a5f1c-5a4b-47e7-8c6f-160eb03fac49 ## Top Findings 1. **[CRITICAL]** Content-Security-Policy header is missing — Security > Security Headers 2. **[CRITICAL]** No Content-Security-Policy header found — Security > Content Security Policy 3. **[CRITICAL]** Page weighs 9.6 MB (5.8 MB transferred) — Performance > Page Weight Budget 4. **[CRITICAL]** 69 image-only link(s) without alt text — Accessibility > Link & Button Quality 5. **[WARNING]** 167 HTTP requests — consider bundling or reducing — Performance > Page Weight Budget --- ## Lighthouse Scores | Category | Score | |----------|-------| | Performance | 65 | | Accessibility | 100 | | Best Practices | 100 | | SEO | 100 | --- ## Security ### Security Headers (C — 55/100) *5 of 10 headers properly configured* - **[WARNING]** HSTS is missing includeSubDomains — Without includeSubDomains, subdomains can still be accessed over HTTP. - **[PASS]** X-Content-Type-Options is properly configured - **[PASS]** X-Frame-Options is properly configured - **[PASS]** Referrer-Policy is properly configured - **[WARNING]** Permissions-Policy header is missing — Controls which browser features (camera, microphone, geolocation) are allowed. Set it to restrict unused features. - **[CRITICAL]** Content-Security-Policy header is missing — CSP is the most important header for preventing XSS attacks. See the CSP section for detailed analysis. - **[WARNING]** Cross-Origin-Opener-Policy header is missing — COOP isolates your browsing context, preventing cross-origin side-channel attacks. Set to 'same-origin'. - **[WARNING]** Cross-Origin-Embedder-Policy header is missing — COEP prevents loading cross-origin resources without explicit permission. Required for SharedArrayBuffer and high-resolution timers. - **[PASS]** X-Powered-By header is not present - **[PASS]** Server header is present without version info ### Content Security Policy (F — 0/100) *No enforcing CSP policy found* - **[CRITICAL]** No Content-Security-Policy header found — CSP is the most effective defense against XSS attacks. Add a Content-Security-Policy header to restrict resource loading. ### TLS & Certificates (A+ — 100/100) *TLS 1.3, 7 checks passed* - **[PASS]** TLS 1.3 is used - **[PASS]** Strong cipher suite is used - **[INFO]** HTTP/2 is not negotiated — HTTP/2 provides multiplexing and header compression for better performance. - **[PASS]** Certificate is valid (expires in 167 days) - **[PASS]** Certificate chain has 3 certificates - **[PASS]** Certificate uses modern signature algorithm - **[PASS]** Certificate covers 27 domain(s) - **[PASS]** Certificate is issued by a trusted CA ### Cookie Security (A+ — 100/100) *No cookies set — no cookie security risks* - **[PASS]** No cookies set — no cookie security risks --- ## Advanced Security ### Subresource Integrity (F — 20/100) *0 of 4 external resources have SRI* - **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code. - **[WARNING]** External script from www.googletagmanager.com lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code. - **[WARNING]** External link from morisawafonts.net lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code. - **[WARNING]** External script from recommend.www-prd.keio.ac.jp lacks integrity attribute — Without SRI, if this CDN is compromised, attackers could inject malicious code. ### JS Library Vulnerabilities (A+ — 100/100) *No known vulnerabilities* - **[PASS]** No known JavaScript library vulnerabilities detected ### Information Leakage (A+ — 100/100) *No exposures* - **[INFO]** No security.txt found — Consider adding a security.txt at /.well-known/security.txt. - **[PASS]** No sensitive files exposed ### Email Security (F — 30/100) *No DMARC* - **[WARNING]** No DMARC record found — Without DMARC, email receivers have no policy for handling authentication failures. ### Permissions-Policy (D — 40/100) *No header set* - **[WARNING]** No Permissions-Policy header — Consider adding a Permissions-Policy header to restrict browser feature access from embedded content. ### CORS Configuration (B — 80/100) *No CORS headers* - **[PASS]** No CORS headers present — secure default --- ## Performance ### Page Weight Budget (F — 0/100) *5.8 MB transferred, 167 requests* - **[CRITICAL]** Page weighs 9.6 MB (5.8 MB transferred) - **[WARNING]** Images are 3.1 MB — compress or use modern formats — Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size. - **[INFO]** Fonts are 2.1 MB — consider subsetting or using system fonts — Subset fonts to include only used characters, or switch to system font stacks. - **[WARNING]** JavaScript is 519 KB — consider code splitting or lazy loading — Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts. - **[WARNING]** 167 HTTP requests — consider bundling or reducing — Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests. - **[INFO]** Estimated 1.2 g CO2 per page load ### Third-Party Impact (D — 50/100) *83% third-party, 0 ms blocking* - **[WARNING]** Third-party code accounts for 83% of page weight (4.9 MiB of 5.8 MiB) - **[PASS]** Third-party blocking time is low (0 ms) ### Text Compression (A+ — 100/100) *All text resources are compressed* - **[PASS]** All text resources are compressed ### Image Optimization (A — 85/100) *21 images, 0 KB saveable* - **[PASS]** All images are well-optimized ### JS Execution Cost (F — 20/100) *4664ms total JS execution* - **[WARNING]** https://www.keio.ac.jp/ja/: 2215ms CPU time - **[WARNING]** https://www.keio.ac.jp/_astro/client.B9bUpm8d.js: 1137ms CPU time - **[WARNING]** Unattributable: 627ms CPU time - **[WARNING]** https://www.googletagmanager.com/gtag/js?id=G-BYN8...: 260ms CPU time - **[WARNING]** https://www.googletagmanager.com/gtm.js?id=GTM-N74...: 251ms CPU time - **[INFO]** Third-party scripts: 1137ms (24% of total) ### Font Loading (A+ — 100/100) *37 fonts (2131 KB)* - **[INFO]** 37 font(s) use font-display: swap (FOUT risk but functional) ### JS Bundles (B — 80/100) *85 scripts, 146 KB unused* - **[WARNING]** https://www.googletagmanager.com/gtag/js?id=G-BYN8...: 65 KB unused (41%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://www.googletagmanager.com/gtm.js?id=GTM-N74...: 61 KB unused (49%) — Consider code splitting or tree shaking to reduce unused code. - **[WARNING]** https://www.keio.ac.jp/_astro/client.B9bUpm8d.js: 21 KB unused (38%) — Consider code splitting or tree shaking to reduce unused code. - **[INFO]** Total unused JavaScript: 146 KB ### Resource Caching (A+ — 100/100) *All resources properly cached* - **[PASS]** No caching issues found ### Critical Rendering Path (A+ — 100/100) *No render-blocking resources* - **[PASS]** No render-blocking resources detected ### Resource Hints (A+ — 100/100) *9 hints, 0 missing preconnects* - **[PASS]** Page uses 9 resource hint(s) ### Page Weight Inventory (D — 45/100) *167 resources · 5.8 MB · 146 KB savings available* - **[WARNING]** Page weight 4.8 MB over 1MB target - **[INFO]** ~146 KB of savings available - **[WARNING]** 64 third-party resources (83% of weight) - **[INFO]** 8 resources over 200KB ### Render-Blocking Resources (A+ — 100/100) *No render-blocking resources detected* - **[PASS]** No render-blocking resources detected in ### Third-Party Resources (A+ — 100/100) *No third-party resources detected* --- ## Content Quality ### Links (A — 95/100) *200 links checked, 199 healthy, 1 broken* - **[WARNING]** 199 of 200 links are healthy - **[CRITICAL]** Broken link: https://www.linkedin.com/school/keio-university — Found in . Returns HTTP 999. ### Mixed Content (A+ — 100/100) *No mixed content detected — all resources use HTTPS.* - **[PASS]** No mixed content detected — all resources use HTTPS ### Open Graph (F — 40/100) *Open Graph tags need attention — social sharing previews may be incomplete.* - **[CRITICAL]** og:image is not reachable — The og:image URL could not be fetched. Social platforms won't be able to display it. - **[WARNING]** Missing og:title — The og:title tag controls the title shown in social sharing previews. - **[WARNING]** Missing og:description — The og:description tag controls the description in social sharing previews. - **[INFO]** Missing og:url — The og:url tag specifies the canonical URL for the shared content. - **[INFO]** Missing og:type — The og:type tag helps social platforms categorize the content. - **[INFO]** Missing og:site_name — The og:site_name tag displays the website name in social previews. - **[INFO]** Missing twitter:card — Without twitter:card, Twitter falls back to Open Graph tags. Adding it gives you more control. ### Structured Data (C — 40/100) *No structured data (JSON-LD) found.* - **[INFO]** No structured data (JSON-LD) found — Adding structured data helps search engines understand your content and can enable rich results. --- ## Infrastructure ### DNS Records (A — 85/100) *4 A records, 44 ms lookup* - **[PASS]** Resolves to 4 IPv4 address(es) - **[PASS]** Has 8 IPv6 (AAAA) record(s) - **[WARNING]** CNAME record at zone apex — A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead. - **[PASS]** 4 nameserver(s) configured - **[INFO]** No MX records — email not configured via DNS - **[INFO]** CAA records not checked — CAA record lookup requires a specialized DNS resolver. This check will be available in a future update. - **[INFO]** No SPF record found in TXT records — SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'. - **[PASS]** DNS resolution time: 44 ms ### Redirect Chain (A — 90/100) *1 redirect(s), 19 ms total* - **[PASS]** Single redirect ### IPv6 Readiness (A+ — 100/100) *IPv6 reachable (1 ms)* - **[PASS]** IPv6 is configured and reachable at 2600:9000:2131:cc00:9:dcf4:5ec0:93a1, 2600:9000:2131:3800:9:dcf4:5ec0:93a1, 2600:9000:2131:3400:9:dcf4:5ec0:93a1, 2600:9000:2131:2800:9:dcf4:5ec0:93a1, 2600:9000:2131:e600:9:dcf4:5ec0:93a1, 2600:9000:2131:1200:9:dcf4:5ec0:93a1, 2600:9000:2131:1a00:9:dcf4:5ec0:93a1, 2600:9000:2131:f000:9:dcf4:5ec0:93a1 ### Crawlability (B — 75/100) *no robots.txt, no sitemap* - **[INFO]** No robots.txt found — robots.txt is optional but recommended. It tells search engine crawlers which pages to index. - **[INFO]** No sitemap.xml found — A sitemap helps search engines discover and index your pages more efficiently. ### URL Variants (A+ — 100/100) *www/non-www, trailing slash, HTTP→HTTPS* - **[PASS]** HTTP correctly 301-redirects to HTTPS ### Domain Intelligence *Domain intelligence data not available* --- ## Compliance ### WCAG Compliance (A+ — 100/100) *No testable criteria* ### Cookie Consent & Privacy (B — 80/100) *No consent signals detected* - **[WARNING]** No privacy policy link detected — A privacy policy page is recommended for transparency and may be legally required. - **[INFO]** No terms of service link detected - **[INFO]** No cookie consent banner detected - **[INFO]** This is an automated check, not legal advice — BeaverCheck detects technical indicators of consent management. This does not constitute a legal compliance assessment. Consult a privacy professional for GDPR/CCPA compliance. ### Language & i18n (A — 90/100) *Lang attribute present* - **[PASS]** attribute is present - **[PASS]** value is valid - **[INFO]** No Content-Language HTTP header - **[INFO]** Language signals are inconsistent — The attribute and Content-Language header should agree. ### Readability & Typography (A+ — 100/100) *Font sizes and tap targets checked* ### Viewport Configuration (A+ — 100/100) *Viewport properly configured* - **[PASS]** Viewport meta tag is present - **[PASS]** width=device-width is set - **[PASS]** User zooming is allowed ### Third-Party Trackers (C — 55/100) *2 trackers detected* - **[INFO]** 2 third-party trackers detected — Found 1 analytics, 0 advertising, 0 marketing, 1 tag manager trackers. - **[WARNING]** Trackers detected but no cookie policy found — This page loads 2 trackers but no cookie policy was detected. GDPR requires disclosure when using tracking cookies. - **[WARNING]** Trackers detected but no privacy policy found — Most data protection regulations require a privacy policy when collecting user data via trackers. ### Cookie & Tracker Inventory (A+ — 100/100) *0 cookies · 2 trackers · 0 pre-consent* - **[INFO]** 2 third-party tracker(s) detected on page --- ## Legal ### Legal Page Ecosystem (F — 0/100) *0 of 7 expected legal pages detected* - **[WARNING]** Privacy Policy not detected — No link matching common Privacy Policy URL patterns or link text was found. Most websites are expected to have a Privacy Policy, especially those collecting user data. - **[WARNING]** Terms of Service not detected — No link matching common Terms of Service URL patterns or link text was found. Most websites are expected to have a Terms of Service, especially those collecting user data. - **[INFO]** Cookie Policy not detected — No link matching common Cookie Policy URL patterns or link text was found. Most websites are expected to have a Cookie Policy, especially those collecting user data. - **[INFO]** Accessibility Statement not detected — No link matching common Accessibility Statement URL patterns or link text was found. Most websites are expected to have a Accessibility Statement, especially those collecting user data. - **[INFO]** DMCA / Copyright Notice not detected — No link matching common DMCA / Copyright Notice URL patterns or link text was found. Most websites are expected to have a DMCA / Copyright Notice, especially those collecting user data. - **[INFO]** Refund / Returns Policy not detected — No link matching common Refund / Returns Policy URL patterns or link text was found. Most websites are expected to have a Refund / Returns Policy, especially those collecting user data. - **[INFO]** Acceptable Use Policy not detected — No link matching common Acceptable Use Policy URL patterns or link text was found. Most websites are expected to have a Acceptable Use Policy, especially those collecting user data. ### Copyright Notice (C — 55/100) *No copyright notice detected* - **[INFO]** No copyright notice detected — No copyright notice detected in the page content. While not legally required in most jurisdictions (copyright exists automatically), a notice is standard practice and signals site ownership. ### Regulatory Indicators *1 regulatory indicator(s) detected* - **[INFO]** This is a technical scan, not a legal assessment — BeaverCheck detects technical indicators that may suggest regulatory relevance. This is not a compliance audit and should not be relied upon for legal decisions. Consult qualified legal counsel for compliance assessments. - **[INFO]** GDPR indicators detected (moderate confidence) — Indicators suggesting GDPR may be relevant: Privacy policy page found. EU General Data Protection Regulation — governs collection and processing of personal data of EU residents. ### Third-Party Data Sharing *2 third-party service(s) detected* - **[INFO]** Data inventory for transparency purposes — This inventory identifies third-party services that receive data from your site visitors. Under regulations like GDPR (Article 30), maintaining records of data processing activities is commonly considered a best practice. This automated scan provides a starting point — it may not capture all data flows. - **[INFO]** 2 third-party services across 2 categories — 2 third-party services detected across 2 categories: Analytics (1), Tag Management (1). Each of these services receives some user data from your site visitors. - **[INFO]** Google Analytics (Analytics) — Detected via script URL. Typically collects: Page views, User behavior, Demographics, Device info, IP address. Privacy policy: https://policies.google.com/privacy. Data Processing Agreement available. - **[INFO]** Google Tag Manager (Tag Management) — Detected via script URL. Typically collects: Orchestrates other tracking scripts, Page views. Privacy policy: https://policies.google.com/privacy. Data Processing Agreement available. ### Compliance Badges (C — 55/100) *0 compliance badge(s) detected* - **[INFO]** No compliance badges detected — No recognized compliance certification badges or seals were found. This is common — many sites do not display compliance badges. --- ## Availability ### CDN & Delivery (A+ — 100/100) *AWS CloudFront (Hit from cloudfront)* - **[PASS]** Site is served via AWS CloudFront CDN (edge: MAD53-P6) - **[PASS]** CDN cache status: Hit from cloudfront ### HTTP Caching (B — 75/100) *public, max-age=0, s-maxage=60, stale-while-revalidate=86400, stale-if-error=86400* - **[PASS]** Cache-Control header is set - **[PASS]** CDN TTL: 1 minute (s-maxage=60) - **[INFO]** No ETag or Last-Modified header — Conditional requests (304 Not Modified) are not possible without validators. ### Transport Security (A+ — 100/100) *HTTP/3, HSTS, and TLS version analysis* - **[PASS]** HTTP/3 (QUIC) supported — The server advertises HTTP/3 via Alt-Svc for faster connections on mobile networks. - **[PASS]** HSTS enabled (base policy) - **[INFO]** HSTS missing includeSubDomains — Without includeSubDomains, HSTS only protects the exact domain. - **[PASS]** TLS 1.3 in use (fastest handshake, 1-RTT) --- ## Accessibility ### Landmark Structure (A — 85/100) *7 landmarks* - **[PASS]**
landmark present - **[PASS]** 3