HTTP headers lookup

What is an HTTP Headers Lookup Tool?

An HTTP Headers Lookup Tool is a tool that retrieves and analyzes the HTTP headers of a website or web server. HTTP headers contain metadata about the request and response between a client (browser, API, or tool) and a web server.

These headers provide important information such as:

• Server type (e.g., Apache, Nginx, Cloudflare)
• Content type (e.g., HTML, JSON)
• Security policies (e.g., HSTS, CSP, CORS)
• Cookies and caching policies
• Redirection details

How HTTP Headers Lookup Works

1. Sending an HTTP Request

   • The tool sends a request to the target website using GET or HEAD methods.

2. Receiving the HTTP Response

   • The web server replies with response headers that contain important details.

3. Extracting and Displaying Headers

   • The tool presents the headers in a structured format for analysis.

Why Use an HTTP Headers Lookup Tool?

1. Debugging & Troubleshooting

   • Check for redirects, errors, and missing headers.
   • Identify wrong content types or broken configurations.

2. Security Analysis

   • Detect missing security headers (e.g., CSP, HSTS, X-Frame-Options).
   • Identify server leaks (e.g., revealing Apache/Nginx version).

3. SEO & Performance Optimization

   • Check caching policies (Cache-Control, Expires) for faster page loads.
   • Verify Gzip compression (Content-Encoding: gzip).

4. Check Website Redirects

   • Find out if a website is using 301 (Permanent) or 302 (Temporary) redirects.
   • Useful for SEO and website migration.

Common HTTP Headers & Their Meaning