tsutsumishop.jp

Readiness by lane

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

Priority fixes for tsutsumishop.jp

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

1. Priority 1 · Enable

   Mobile viewport configured

   Observed: The homepage had no viewport meta tag, so phones may render it zoomed out.

   Why it matters: Without it, phones render the page at desktop width and shrink it, which makes text tiny and hard to use.

   What to do: Add <meta name="viewport" content="width=device-width, initial-scale=1"> and check the layout on small screens.

   98% of E-Commerce & Marketplaces peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

   Guide: Responsive Web Design Checklist for Real Devices

2. 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.

   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 37 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 · 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

What tsutsumishop.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.32% of peers
• Content Security Policy presentContent-Security-Policy present.48% of peers

What we saw

Homepage checked

https://www.tsutsumishop.jp/

Homepage response

HTTP 200, after 1 redirect

TLS

TLSv1.3, HTTP/2

Certificate

GlobalSign, 396-day validity, expiring 2027-03-23

CDN or edge

Amazon CloudFront

DNS operators

Amazon Route 53

HSTS

max-age 365 days

Homepage HTML

77 KB, gzip

Images on homepage

37 (jpg 28, png 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

Compare with other E-Commerce & Marketplaces sites

• amazon.de52
• smile.one53
• sonymusicshop.jp53
• tendenz.bg53
• vivo.com53

E-Commerce & Marketplaces readiness benchmark