violet.vn
Thư viện trực tuyến ViOLET
Last scanned Aug 2, 2026, 2:00 AM · 8 views
Overall score
Fair
Summary
Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học. This website uses PHP. SEO is fair (60/100) and accessibility is good (85/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing canonical link.
Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học
Top issues to fix
12 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+6 more issues — details in the sections below.
SEO
6 issue(s) found
Performance
235 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Score history
+7 overall since Jul 26, 2026
- Overall
- 79
- SEO
- 60
- Security
- 75
- Performance
- 100
- Accessibility
- 85
Organization
Company details published in this site's own structured data.
Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Thư viện trực tuyến ViOLET
- Description
- Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- Robots meta
- index, follow
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- GlobalSign nv-sa
- Subject
- *.violet.vn
- Valid from
- Oct 9, 2025
- Valid to
- Nov 10, 2026
- Days until expiry
- 100
- SAN domains
- *.violet.vn, violet.vn
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 0 · H2 13 · H3 0
Links
59 internal · 7 external · 20 broken
Images
38 total · 7 missing alt
Scripts / Styles
6 scripts · 1 stylesheets
JS / CSS size
603 B · 465 B
Page size
30.3 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
- Missing viewport meta tag
Scan details
- Requested URL
- https://violet.vn
- Final URL
- https://violet.vn
- HTTP status
- 200
- HTTP version
- HTTP/1.0
- Response time
- 235 ms
- HTML size
- 30.3 KB
- Redirect chain
- https://violet.vn
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does violet.vn use?
- violet.vn is built with PHP, Google Analytics, Apache.
- Is violet.vn secure (HTTPS)?
- Yes. violet.vn uses TLS 1.2 with a certificate issued by GlobalSign nv-sa, valid until Nov 10, 2026.
- Who hosts violet.vn?
- Hosting provider information for violet.vn is not available yet.
- What is violet.vn's SEO score?
- violet.vn scored 60/100 for SEO in the latest analysis (fair).
- What is violet.vn's overall website score?
- violet.vn has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.
- Has violet.vn's score changed over time?
- violet.vn's overall score has improved by 7 points (from 72 to 79) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card