attenir.co.jp

Readiness by lane

Green: attenir.co.jp. Thin bar: E-Commerce & Marketplaces peer median.

Priority fixes for attenir.co.jp

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

1. Priority 1 · 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.

   Why it matters: Returning visitors and later page views reuse cached files instead of downloading them again.

   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.

   60% of E-Commerce & Marketplaces peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: Browser Caching Guide for Website Owners

2. Priority 2 · Enable

   Canonical URL declared

   Observed: The homepage did not declare a canonical URL.

   What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.

   85% of E-Commerce & Marketplaces peers do this.

   Guide: Canonical Tags: A Decision Guide for Duplicate URLs

3. Priority 3 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for attenir.co.jp was p=none, which asks receivers to take no action on failing mail.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   39% of E-Commerce & Marketplaces peers do this.

   Guide: A Practical Website Health Check for Owners

4. Priority 4 · Harden

   Content Security Policy present

   Observed: The homepage response did not include a Content-Security-Policy header.

   What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.

   48% of E-Commerce & Marketplaces peers do this.

   Guide: Payment Security and PCI DSS: What Website Owners Need to Know

What attenir.co.jp already does well

Practices fewer than half of E-Commerce & Marketplaces peers use.

• HSTS kept for at least a yearHSTS with a 365-day max-age covering subdomains.32% of peers
• No render-blocking scripts in <head>Head scripts load without blocking.44% of peers
• Modern image formats in useWebP or AVIF images detected.47% of peers

What we saw

Homepage checked

https://www.attenir.co.jp/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

DigiCert, 198-day validity, expiring 2027-04-24

CDN or edge

Amazon CloudFront

DNS operators

1 self-run or other nameserver domain

HSTS

max-age 365 days, includeSubDomains

DMARC policy

p=none

Homepage HTML

50 KB, gzip

Images on homepage

41 (webp 38, png 11)

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 E-Commerce & Marketplaces sites

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• baldai1.lt68

E-Commerce & Marketplaces readiness benchmark