vietjack.com

Readiness by lane

Green: vietjack.com. Thin bar: Education & Online Learning peer median.

Priority fixes for vietjack.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Accelerate

   HTTP/2 negotiated

   Observed: The TLS handshake selected HTTP/1.1 instead of HTTP/2.

   Why it matters: HTTP/2 sends many files over one connection, which speeds up pages with lots of images, styles and scripts.

   What to do: Enable HTTP/2 on your CDN or server. Most CDNs do this by default.

   80% of Education & Online Learning peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.

   Guide: CDN Guide for Website Owners

2. Priority 2 · Enable

   robots.txt published

   Observed: No robots.txt file was returned at the site root.

   What to do: Publish /robots.txt with any crawl rules you need and a Sitemap: line pointing to your XML sitemap.

   82% of Education & Online Learning peers do this.

   Guide: Robots.txt Guide: Control Crawling Without Hiding Mistakes

3. Priority 3 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   34% of Education & Online Learning peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   65% of Education & Online Learning peers do this.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

What vietjack.com already does well

Practices fewer than half of Education & Online Learning peers use.

• Modern image formats in useWebP or AVIF images detected.32% of peers

What we saw

Homepage checked

https://vietjack.com/

Homepage response

HTTP 200

TLS

TLSv1.3

Certificate

Sectigo, 198-day validity, expiring 2026-12-23

DNS operators

1 self-run or other nameserver domain

DMARC policy

p=none

Homepage HTML

414 KB, gzip

Images on homepage

29 (png 17, webp 8, svg 3, gif 1)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Education & Online Learning sites

• blockly.games40
• emaktab.uz40
• shingakunet.com41
• srichaitanyaschool.net41
• uniecampus.it41

Education & Online Learning readiness benchmark