nicovideo.jp

Readiness by lane

Green: nicovideo.jp. Thin bar: Live Streaming peer median.

Priority fixes for nicovideo.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.

   92% of Live Streaming 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 900 seconds, 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.

   48% of Live Streaming peers do this.

   Guide: Browser Caching Guide for Website Owners

3. 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.

   29% of Live Streaming peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for nicovideo.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.

   29% of Live Streaming peers do this.

   Guide: A Practical Website Health Check for Owners

What nicovideo.jp already does well

Practices fewer than half of Live Streaming peers use.

• Content Security Policy presentContent-Security-Policy present.24% of peers
• X-Content-Type-Options: nosniffnosniff header present.31% of peers
• Framing restrictedFraming controls present.39% of peers

What we saw

Homepage checked

https://www.nicovideo.jp/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Amazon, 197-day validity, expiring 2027-04-30

CDN or edge

Amazon CloudFront

DNS operators

Amazon Route 53

DMARC policy

p=none

Homepage HTML

146 KB, gzip

Images on homepage

0

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 Live Streaming sites

• douyu.com60
• hot51.llc65
• latina.pe64
• rplay.live63
• valorantesports.com60

Live Streaming readiness benchmark