yomiuri.co.jp

Readiness by lane

Green: yomiuri.co.jp. Thin bar: News & Media peer median.

Priority fixes for yomiuri.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 News & Media 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 1 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.

   On WordPress: Caching plugins or your host can set long browser cache lifetimes for theme and plugin assets.

   60% of News & Media peers do this.

   Guide: Browser Caching Guide for Website Owners

3. Priority 3 · Accelerate

   Modern image formats in use

   Observed: The homepage had 277 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.

   On WordPress: WordPress has supported WebP uploads since 5.8 and AVIF since 6.5; image plugins or the host can convert existing images.

   44% of News & Media 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: No DMARC record was found at _dmarc.yomiuri.co.jp.

   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.

   37% of News & Media peers do this.

   Guide: A Practical Website Health Check for Owners

What yomiuri.co.jp already does well

Practices fewer than half of News & Media peers use.

• DNSSEC signedDNSSEC delegation (DS record) present.6.1% of peers
• Nameservers spread across providersNameservers spread across more than one operator.11% of peers
• HSTS kept for at least a yearHSTS with a 730-day max-age covering subdomains.35% of peers

What we saw

Homepage checked

https://www.yomiuri.co.jp/

Homepage response

HTTP 200

TLS

TLSv1.2, HTTP/2

Certificate

Cybertrust Japan Co., Ltd., 394-day validity, expiring 2026-11-18

CDN or edge

Fastly

Platform or framework

WordPress

DNS operators

3 self-run or other nameserver domains

HSTS

max-age 730 days, includeSubDomains, preload

Homepage HTML

448 KB, br

Images on homepage

277 (jpg 431, png 49, svg 12)

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 News & Media sites

• xatakamovil.com66
• xn--b1agapfwapgcl.xn--p1ai66
• yenicaggazetesi.com66
• yorkpress.co.uk66
• zakzak.co.jp66

News & Media readiness benchmark