navima.jp

Readiness by lane

Green: navima.jp. Thin bar: Education & Online Learning peer median.

Priority fixes for navima.jp

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

1. Priority 1 · Accelerate

   HTML compressed

   Observed: The homepage HTML (32 KB) was delivered without gzip, Brotli or zstd compression.

   Why it matters: Compression usually shrinks HTML several times over, so the first bytes of the page arrive sooner on slow connections.

   What to do: Enable Brotli or gzip for text responses (HTML, CSS, JavaScript, JSON, SVG) at the CDN or origin.

   90% of Education & Online Learning peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: How to Set a Website Performance Budget That Teams Can Keep

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 navima.jp already does well

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

• DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.36% of peers

What we saw

Homepage checked

https://www.navima.jp/

Homepage response

HTTP 200, after 2 redirects

TLS

TLSv1.3, HTTP/2

Certificate

Amazon, 393-day validity, expiring 2027-03-10

DNS operators

Amazon Route 53

DMARC policy

p=quarantine

Homepage HTML

32 KB, uncompressed

Images on homepage

16 (png 8, jpg 8)

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

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Education & Online Learning readiness benchmark