Website readiness profile · Snapshot 23 October 2026

kadokawa.co.jp

kadokawa.co.jp's public homepage, certificate and DNS checked against 31 practices and compared with 306 Online Publishing sites.

Readiness index: 47/100
Ahead of: 9.2%
Practices observed: 13/31
Popularity band: Top 50K

Measured 2026-10-23 11:43:08 UTC from one location. How we measure

Readiness by lane

Green: kadokawa.co.jp. Thin bar: Online Publishing peer median.

Enable

92/100

Peers 84

Harden

38/100

Peers 51

Accelerate

18/100

Peers 65

Recover

0/100

Peers 5

Priority fixes for kadokawa.co.jp

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

Priority 1 · Accelerate
HTML compressed
Observed: The homepage HTML (169 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.
On Amazon CloudFront: Enable Compress objects automatically on the cache behaviour.
94% of Online Publishing 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
Priority 2 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for no max-age, short of the 30-day benchmark.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
57% of Online Publishing peers do this.
Guide: Browser Caching Guide for Website Owners
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.
On Amazon CloudFront: Attach a response headers policy with Strict-Transport-Security to each distribution.
27% of Online Publishing peers do this.
Guide: HTTPS and TLS Guide for Website Owners
Priority 4 · Accelerate
Modern image formats in use
Observed: The homepage had 78 images and none used WebP or AVIF.
What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.
38% of Online Publishing peers do this.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

What kadokawa.co.jp already does well

Practices fewer than half of Online Publishing peers use.

Reachable over IPv6IPv6 address published.48% of peers

What we saw

Homepage checked: https://www.kadokawa.co.jp/
Homepage response: HTTP 200
TLS: TLSv1.3, HTTP/2
Certificate: Amazon, 197-day validity, expiring 2026-12-22
CDN or edge: Amazon CloudFront
DNS operators: Amazon Route 53
DMARC policy: p=none
Homepage HTML: 169 KB, uncompressed
Images on homepage: 78 (png 62, jpg 16)

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.

Amazon CloudFront (cdn and edge platform)Amazon Route 53 (dns operator)Amazon (certificate authority)Service guide: AWS (Amazon Web Services)

All 31 checks

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

Not observed 18

Observed 13

HTTP requests move to HTTPS
TLS 1.3 negotiated
Certificate has more than 14 days left
HTTP/2 negotiated
robots.txt published
XML sitemap discoverable
Reachable over IPv6
Canonical URL declared
Meta description written
Mobile viewport configured
Social preview image set
Page language declared
At most one redirect to the homepage

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Live status for this site: Status Is Down: kadokawa.co.jp. This profile covers configuration only.

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