vio.edu.vn
Toán trực tuyến, đề thi thử toán - VioEdu
Last scanned Aug 24, 2026, 1:23 PM
Overall score
Excellent
Summary
VioEdu hệ thống học toán trên mạng, cá nhân hóa quá trình học tập cho học sinh với lộ trình học phù hợp. This website uses Nginx. SEO is good (75/100) and accessibility is good (85/100). Security scores excellent (100/100) and performance excellent (100/100). Top issue: Missing canonical link.
VioEdu hệ thống học toán trên mạng, cá nhân hóa quá trình học tập cho học sinh với lộ trình học phù hợp
Top issues to fix
7 issues found
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.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
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.
More than 20% of images are missing alt text
AccessibilityAdd alt attributes to the remaining images (use alt="" for purely decorative ones).
+1 more issue — details in the sections below.
SEO
4 issue(s) found
Performance
159 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- support@vio.edu.vn
- Phone
- 19006361110353055060
Meta tags
- Title
- Toán trực tuyến, đề thi thử toán - VioEdu
- Description
- VioEdu hệ thống học toán trên mạng, cá nhân hóa quá trình học tập cho học sinh với lộ trình học phù hợp
- Canonical
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0, user-scalable=no, maximum-scale=1, shrink-to-fit=no
- Robots meta
- Manifest
- https://vio.edu.vn/site.webmanifest
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
- Sectigo Limited
- Subject
- *.vio.edu.vn
- Valid from
- Feb 23, 2026
- Valid to
- Mar 26, 2027
- Days until expiry
- 213
- SAN domains
- *.vio.edu.vn, vio.edu.vn
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 7 · H3 0
Links
12 internal · 18 external · 2 broken
Images
65 total · 27 missing alt
Scripts / Styles
37 scripts · 14 stylesheets
JS / CSS size
35.2 KB · 163 KB
Page size
230 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 structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
Scan details
- Requested URL
- https://vio.edu.vn
- Final URL
- https://vio.edu.vn
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 155 ms
- HTML size
- 230 KB
- Redirect chain
- https://vio.edu.vn
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does vio.edu.vn use?
- vio.edu.vn is built with Google Analytics, Google Ads, Meta Pixel, Nginx.
- Is vio.edu.vn secure (HTTPS)?
- Yes. vio.edu.vn uses TLS 1.2 with a certificate issued by Sectigo Limited, valid until Mar 26, 2027.
- Who hosts vio.edu.vn?
- Hosting provider information for vio.edu.vn is not available yet.
- What is vio.edu.vn's SEO score?
- vio.edu.vn scored 75/100 for SEO in the latest analysis (fair).
- What is vio.edu.vn's overall website score?
- vio.edu.vn has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card