HTTP Headers Checker – View Response Headers of Any URL

HTTP headers lookup – Free Online Tool

Our free HTTP Headers Lookup shows the response headers a server sends for any URL. Check status codes, caching, compression, security headers and redirects in one click.

What is HTTP headers lookup?

Every time a browser loads a page, the server first replies with HTTP headers — hidden lines of information such as the status code (200, 301, 404), content type, cache rules, server software and security policies.

These headers strongly affect speed, security and SEO, yet they are invisible on the page itself. A headers checker reveals them instantly.

How to use the HTTP headers lookup

1. Enter the full URL including https://.
2. Click submit.
3. Review the status code and the list of headers.
4. Fix issues such as missing caching, wrong redirects or absent security headers.

Key features

• Shows HTTP status code
• Lists all response headers
• Helps spot redirect and cache problems
• Free and instant

Common use cases

• Checking 301 vs 302 redirects for SEO
• Verifying cache-control and compression settings
• Auditing security headers such as HSTS and Content-Security-Policy
• Confirming the correct content type is served

Frequently asked questions

What does status code 200 mean?

The request succeeded and the page was returned normally.

What is the difference between 301 and 302?

301 is a permanent redirect that passes SEO value; 302 is temporary.

Which security headers should a site have?

Common ones are Strict-Transport-Security, X-Content-Type-Options, X-Frame-Options and Content-Security-Policy.

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