Get API Key API

HTTP Headers Checker

View and analyze HTTP response headers from any website

Enter the full URL including http:// or https://
google.com
github.com
cloudflare.com
amazon.com

Fetching HTTP headers...

✓

HTTP Response Headers

URL:
Status:
Time:
Header Name Value
⚠️ Error:

What are HTTP Headers?

HTTP headers are additional pieces of information sent between a client (browser) and server during an HTTP request/response. They provide metadata about the request or response, such as content type, caching policies, security settings, and more.

Important Security Headers:

Why Check HTTP Headers?

What is HTTP Headers Checker?

HTTP Headers Checker analyzes the HTTP response headers returned by any website. These headers contain crucial information about server configuration, security policies, caching behavior, content encoding, and more. Understanding HTTP headers helps developers optimize performance and security.

Key Features

Complete Header List

View all HTTP response headers including custom and non-standard headers sent by the server.

Security Analysis

Check for important security headers like Content-Security-Policy, X-Frame-Options, and HSTS.

Cache Headers

Analyze Cache-Control, ETag, and Expires headers to understand caching behavior.

Server Information

Identify server software, powered-by headers, and technology stack details.

Copy to Clipboard

One-click copy of all headers for documentation, debugging, or sharing with team members.

Categorized View

Headers organized by category: Security, Caching, Content, Server, and Custom headers.

How to Use

  1. Enter URL: Type or paste the website URL you want to analyze.
  2. Check Headers: Click "Check Headers" to fetch HTTP response headers from the server.
  3. Review Results: Examine headers organized by category with color-coded highlighting.
  4. Check Security: Look for missing security headers highlighted with warnings.
  5. Copy Headers: Use the copy button to save headers for documentation or debugging.

Frequently Asked Questions

What are HTTP headers used for?

HTTP headers carry metadata about the request/response cycle. They define content type (text/html, application/json), encoding (gzip, deflate), caching policies, authentication requirements, security restrictions, cookies, and server information. Headers control how browsers interpret and handle responses.

Which security headers should every website have?

Essential security headers include: Strict-Transport-Security (HSTS) to enforce HTTPS, Content-Security-Policy (CSP) to prevent XSS attacks, X-Frame-Options to block clickjacking, X-Content-Type-Options to prevent MIME sniffing, Referrer-Policy to control referrer information, and Permissions-Policy to restrict browser features.

What does Cache-Control header do?

Cache-Control directs browsers and CDNs on caching behavior. Common directives: max-age (how long to cache), no-cache (validate before using cache), no-store (never cache), public (cacheable by any cache), private (only browser cache), and immutable (content won't change). Proper caching significantly improves performance.

Why is Content-Security-Policy important?

Content-Security-Policy (CSP) is crucial for preventing Cross-Site Scripting (XSS) attacks. It specifies which sources can load scripts, styles, images, and other resources. A properly configured CSP blocks inline scripts, unauthorized external resources, and prevents attackers from injecting malicious code even if they find an XSS vulnerability.