SEO Tools

HTTP headers lookup

Inspect and analyze all HTTP response headers, security policies (CSP, HSTS), and status codes returned by any web server.

HTTP Status (200, 301, 404) En-têtes de Sécurité (CSP, HSTS) Cache & CDN Serveur Web

HTTP Response Headers & Web Security Guide

Understand HTTP response headers, security policies (HSTS, CSP), and caching optimization.

HTTP Response Headers are the essential metadata exchanged between web servers and clients during every request. They determine content encoding, HTTP status codes (200, 301, 404), browser caching rules, and vital defensive layers against cyber threats such as cross-site scripting (XSS), clickjacking, and MIME confusion attacks.

Security

HSTS & CSP

Strict-Transport-Security enforces continuous HTTPS, while Content-Security-Policy restricts unauthorized external script injection.

Speed

Cache-Control

Instructs browsers and edge CDNs on static asset caching expiration (e.g., max-age=31536000, immutable).

SEO & Bot

X-Robots-Tag

Applies indexing directives (noindex, nofollow) directly to non-HTML resources such as PDF documents and images.

Protection

X-Frame-Options

Blocks unauthorized third-party iframes from rendering your website, preventing clickjacking attacks.

Essential Production Security Headers Checklist

  • Strict-Transport-Security : Set max-age=31536000; includeSubDomains; preload for absolute HTTPS enforcement.
  • X-Content-Type-Options : Set to nosniff to prevent browsers from MIME-sniffing away from declared types.
  • X-Frame-Options : Use DENY or SAMEORIGIN to neutralize framing exploits.
  • Referrer-Policy : Configure strict-origin-when-cross-origin to protect outbound URL parameters.
  • Permissions-Policy : Disable unused APIs (e.g. geolocation=(), camera=(), microphone=()).
  • Hide Server Signatures : Strip X-Powered-By and minimize Server headers to block server fingerprinting.

Questions Fréquemment Posées (FAQ)

Tout ce que vous devez savoir pour exploiter au mieux cet outil.

HTTP response headers are metadata transmitted by a web server before the document body. They instruct clients on status codes, content MIME types, compression, caching directives, and security requirements.

Security headers provide defense-in-depth against common cyber threats, including Cross-Site Scripting (XSS), clickjacking, and packet sniffing.

Correct HTTP status codes (200, 301), proper caching rules, and X-Robots-Tag directives maximize crawl efficiency and ensure optimal indexing.

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