HTTP Header Viewer
Inspect HTTP response headers including status codes, security headers, caching policies, CORS settings, and redirects. Analyze website security and performance configuration.
Our free HTTP header viewer tool allows you to inspect all HTTP response headers from any website. Check security headers, caching policies, CORS settings, status codes, and more. Perfect for web developers, security auditors, and SEO professionals analyzing website configuration.
About HTTP Headers
HTTP headers provide important information about the server response, security policies, caching behavior, and CORS settings.
- Security Headers: Protect against XSS, clickjacking, and other attacks
- Caching Headers: Control how content is cached by browsers and CDNs
- CORS Headers: Allow cross-origin resource sharing for APIs
- General Headers: Provide metadata about the response
What are HTTP Headers?
HTTP headers are key-value pairs sent between client and server during HTTP communication. Response headers provide metadata about the server response including content type, caching rules, security policies, and server information.
Key Header Categories
Security Headers
Headers like X-Frame-Options, Content-Security-Policy, and Strict-Transport-Security protect against attacks like XSS, clickjacking, and man-in-the-middle.
Caching Headers
Control browser and CDN caching with Cache-Control, ETag, Expires, and Age headers to optimize performance and reduce server load.
Frequently Asked Questions
What is a security header?
Security headers are HTTP response headers that instruct browsers on how to behave when handling your site's content. They help protect against common web vulnerabilities like XSS, clickjacking, and protocol downgrade attacks.
Why check HTTP headers?
Checking HTTP headers helps you verify security configurations, optimize caching strategies, debug CORS issues, identify server software, and ensure proper redirect chains. It's essential for security audits and performance optimization.