vnoi.info
Trang chủ - VNOJ: VNOI Online Judge
Last scanned Jul 26, 2026, 11:49 AM
Overall score
Great
Summary
VNOJ - Online Judge chính thức của VNOI. This website uses Google Analytics behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (90/100). Security scores good (75/100) and performance excellent (100/100). Top issue: No H1 heading found.
VNOJ - Online Judge chính thức của VNOI.
Top issues to fix
7 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
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 X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
357 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
VNOJ - Online Judge chính thức của VNOI.
Meta tags
- Title
- Trang chủ - VNOJ: VNOI Online Judge
- Description
- VNOJ - Online Judge chính thức của VNOI.
- Canonical
- https://oj.vnoi.info/
- Language
- vi
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- vnoi.info
- Valid from
- Jul 9, 2026
- Valid to
- Oct 7, 2026
- Days until expiry
- 70
- SAN domains
- vnoi.info, *.vnoi.info
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 10 · H3 14
Links
88 internal · 23 external · 20 broken
Images
11 total · 0 missing alt
Scripts / Styles
15 scripts · 3 stylesheets
JS / CSS size
2.5 KB · 0 B
Page size
85.7 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No H1 heading found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://vnoi.info
- Final URL
- https://oj.vnoi.info
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 356 ms
- HTML size
- 85.7 KB
- Redirect chain
- https://vnoi.info → https://oj.vnoi.info
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does vnoi.info use?
- vnoi.info is built with Django, Google Analytics, Cloudflare Analytics.
- Is vnoi.info secure (HTTPS)?
- Yes. vnoi.info uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 7, 2026.
- Who hosts vnoi.info?
- Hosting provider information for vnoi.info is not available yet.
- What is vnoi.info's SEO score?
- vnoi.info scored 80/100 for SEO in the latest analysis (great).
- What is vnoi.info's overall website score?
- vnoi.info has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card