askul.co.jp

Readiness by lane

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

Priority fixes for askul.co.jp

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

1. Priority 1 · Harden

   TLS 1.3 negotiated

   Observed: The TLS connection negotiated TLSv1.2.

   Why it matters: TLS 1.3 removes legacy cipher suites and completes the handshake in fewer round trips, so it is both safer and faster for new connections.

   What to do: Enable TLS 1.3 on your CDN or server. Keep TLS 1.2 available for older clients unless you have checked your audience.

   93% of E-Commerce & Marketplaces peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Accelerate

   Static files cached for 30 days or more

   Observed: A same-site stylesheet or script was cacheable for 7 days, 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.

   60% of E-Commerce & Marketplaces peers do this.

   Guide: Browser Caching Guide for Website Owners

3. Priority 3 · Accelerate

   Modern image formats in use

   Observed: The homepage had 50 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.

   47% of E-Commerce & Marketplaces peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

4. Priority 4 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for askul.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

What askul.co.jp already does well

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

• Nameservers spread across providersNameservers spread across more than one operator.11% of peers
• 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

What we saw

Homepage checked

https://www.askul.co.jp/

Homepage response

HTTP 200

TLS

TLSv1.2, HTTP/2

Certificate

Cybertrust Japan Co., Ltd., 198-day validity, expiring 2027-03-28

DNS operators

3 self-run or other nameserver domains

HSTS

max-age 365 days, includeSubDomains

DMARC policy

p=none

Homepage HTML

134 KB, gzip

Images on homepage

50 (png 23, jpg 20, gif 7)

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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E-Commerce & Marketplaces readiness benchmark