HTTP Headers: book.dmm.co.jp

Security score: 60/100

🛡️ Security Headers

Header	Status
Strict-Transport-Security	✅ Present
Content-Security-Policy	❌ Missing
X-Content-Type-Options	✅ Present
X-Frame-Options	✅ Present
X-XSS-Protection	❌ Missing

📋 All Response Headers

Content-Type
Content-Length
Connection
Date
Vary
Referrer-Policy
Strict-Transport-Security
X-Content-Type-Options
X-DNS-Prefetch-Control
X-Download-Options
X-Frame-Options
X-Permitted-Cross-Domain-Policies
X-XSS-Protection
Surrogate-Control
Cache-Control
Expires
X-Request-Id
Set-Cookie
X-Powered-By
ETag
X-Cache
Via
X-Amz-Cf-Pop
X-Amz-Cf-Id

ℹ️ About HTTP Security Headers

Strict-Transport-Security (HSTS) forces browsers to use HTTPS. Content-Security-Policy (CSP) prevents XSS attacks by controlling which resources can load. X-Content-Type-Options stops MIME-type sniffing. X-Frame-Options blocks clickjacking by preventing iframe embedding.

book.dmm.co.jp's security score of 60/100 reflects how many of these protective headers are configured. Higher scores indicate better defense against common web attacks.

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