HTTP Headers Checker

Inspect raw HTTP response headers from any live URL.

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HTTP Headers Input

Server-Side Request: To bypass browser CORS restrictions, header requests are made from our server.

Understanding HTTP Headers

HTTP headers are core components of HTTP requests and responses. They pass additional information between the client (e.g., your browser) and the server. This tool fetches and displays the response headers sent by the server for a given URL.

Why Check HTTP Headers?

  • Debugging: Identify issues related to caching, content types, or server configurations.
  • SEO Analysis: Check for correct status codes (e.g., 301 redirects, 404 errors), caching policies, and content encoding.
  • Security Audits: Verify implementation of security headers like Content-Security-Policy, Strict-Transport-Security, or X-Frame-Options.
  • Performance Optimization: Analyze caching headers (Cache-Control, Expires, ETag) and content compression (Content-Encoding).
  • Understanding Server Behavior: See what web server software is being used (Server header) or how it handles cookies (Set-Cookie).

Common Headers & Their Meanings:

  • Status Code: Indicates the result of the request (e.g., 200 OK, 301 Moved Permanently, 404 Not Found, 500 Internal Server Error).
  • Content-Type: Specifies the media type of the resource (e.g., text/html, application/json).
  • Cache-Control: Directives for caching mechanisms in both requests and responses.
  • Set-Cookie: Sends cookies from the server to the user agent.
  • Server: Information about the server software used.
  • Date: The date and time at which the message was originated.

This tool makes a server-side request to the target URL to fetch its headers, bypassing typical browser CORS restrictions for a comprehensive analysis.