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gihyo.jp

gihyo.jp | gihyo.jp

Last scanned Jul 26, 2026, 11:49 AM

87

Overall score

Great

Summary

技術評論社提供のIT関連コンテンツサイト. This website uses Google Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: No structured data (JSON-LD) found.

技術評論社提供のIT関連コンテンツサイト

United States
Hosted on Cloudflare

Top issues to fix

7 issues found · 2 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • 2 cookies without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+1 more issue — details in the sections below.

85

SEO

2 issue(s) found

100

Performance

563 ms

65

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

技術評論社提供のIT関連コンテンツサイト

Meta tags

Title
gihyo.jp | gihyo.jp
Description
技術評論社提供のIT関連コンテンツサイト
Canonical
https://gihyo.jp/
Language
ja
Charset
UTF-8
Viewport
width=device-width, initial-scale=1.0
Robots meta
Manifest
https://gihyo.jp/manifest.webmanifest

OpenGraph & Twitter Card

OpenGraph

og:title
gihyo.jp
og:description
技術評論社提供のIT関連コンテンツサイト
og:type
website
og:url
https://gihyo.jp/

Twitter Card

twitter:card
summary_large_image
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google AnalyticsCloudflare AnalyticsGoogle Ads

Hosting & CDN

Hosting provider
Cloudflare
CDN provider
Cloudflare
IP address
104.20.27.154
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 104.20.27.154
  • 172.66.164.73
AAAA
  • 2606:4700:10::6814:1b9a
  • 2606:4700:10::ac42:a449
MX—
TXT
  • google-site-verification=8RpbsDPIzbPNL4HHJqSrXSfRanlSWeB8R0KtvpPbCCI
  • v=spf1 include:gihyo.co.jp -all
NS
  • bill.ns.cloudflare.com
  • laura.ns.cloudflare.com
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
gihyo.jp
Valid from
Jun 4, 2026
Valid to
Sep 2, 2026
Days until expiry
35
SAN domains
*.gihyo.jp, gihyo.jp

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 2 cookie(s) observed

Content & assets

Headings

H1 1 · H2 3 · H3 0

Links

60 internal · 0 external · 0 broken

Images

33 total · 0 missing alt

Scripts / Styles

17 scripts · 2 stylesheets

JS / CSS size

148 KB · 0 B

Page size

67.2 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
4
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • No structured data (JSON-LD) found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://gihyo.jp
Final URL
https://gihyo.jp
HTTP status
200
HTTP version
HTTP/2
Response time
562 ms
HTML size
67.2 KB
Redirect chain
https://gihyo.jp

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does gihyo.jp use?
gihyo.jp is built with Google Analytics, Cloudflare Analytics, Google Ads.
Is gihyo.jp secure (HTTPS)?
Yes. gihyo.jp uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 2, 2026.
Who hosts gihyo.jp?
gihyo.jp is hosted on Cloudflare, behind Cloudflare CDN.
What is gihyo.jp's SEO score?
gihyo.jp scored 85/100 for SEO in the latest analysis (great).
What is gihyo.jp's overall website score?
gihyo.jp has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.