HTTP Headers Checker
Analyze Server Responses
Display response headers, status code, server type, cache information, and security headers for any URL
Frequently Asked Questions
What are HTTP Headers?
HTTP headers are hidden pieces of information transferred between a web server and a client (like your browser) with every request and response. They contain metadata about the document being requested, the server, caching policies, and security configurations.
What does the Status Code mean?
The status code tells you whether a specific HTTP request has been successfully completed. For example, 200 means OK (Success), 301 means Permanent Redirect, 404 means Not Found, and 500 means Internal Server Error.
Why should I check HTTP headers?
Developers check headers to troubleshoot caching issues, verify server software (like Nginx or Apache), ensure secure cookies are being set, and audit security policies like Content-Security-Policy (CSP) or Strict-Transport-Security (HSTS).
What are security headers?
Security headers are specific directives that tell the browser how to behave to prevent attacks. For example, X-Frame-Options prevents clickjacking, and Strict-Transport-Security forces the browser to use secure HTTPS connections.
How can I see headers in my browser?
You can view HTTP headers in any modern browser by opening the Developer Tools (usually F12), navigating to the 'Network' tab, reloading the page, and clicking on the specific network request.