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HTTP Header Checker

Check HTTP response headers for any URL. Analyze server and security headers.

Note: This tool requires the backend API to fetch HTTP headers from remote servers. Browser-based requests are limited by CORS policies.

How to Use HTTP Header Checker

1

Enter the URL

Type or paste any publicly accessible URL you want to inspect. The tool accepts any valid HTTP or HTTPS URL.

2

Fetch headers

Click check to send a request and retrieve all HTTP response headers from the server. Results appear instantly.

3

Analyze the results

Review status codes, security headers, caching policies, and server information. Missing or misconfigured headers are highlighted for easy identification.

About HTTP Header Checker

HTTP header checker online — inspect and analyze HTTP response headers for any URL instantly for free. View status codes, content-type, cache-control, CORS, CSP, HSTS, X-Frame-Options, and all server response headers. Identify missing security headers, misconfigured caching policies, and server technology details. Essential for web developers, security professionals, and SEO specialists auditing website configurations. Check any publicly accessible URL and get a complete breakdown of all HTTP response headers.

Key Features

  • Inspect all HTTP response headers for any URL including status codes and server information
  • Check security headers like HSTS, CSP, X-Frame-Options, and X-Content-Type-Options instantly
  • View CORS configuration and cross-origin resource sharing policies for API debugging
  • Analyze cache-control, expires, and ETag headers for optimal caching performance
  • Identify missing or misconfigured security headers with actionable recommendations
  • Free online HTTP header inspection tool — no signup, no software installation required

Frequently Asked Questions

How to check HTTP response headers for a website?▾
Enter the website URL and click check. All HTTP response headers are displayed including status code, content-type, cache-control, security headers, and server information.
How to check if a website has security headers?▾
Enter the URL and look for HSTS, CSP, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy headers. Missing security headers are highlighted in the results.
How to check CORS headers for an API?▾
Enter the API endpoint URL to view Access-Control-Allow-Origin, Access-Control-Allow-Methods, and other CORS headers that control cross-origin access.
How to check HTTP status codes?▾
The status code (200, 301, 404, 500, etc.) is displayed prominently at the top of the results. It shows whether the request succeeded, redirected, or failed.
How to check cache-control headers?▾
Enter the URL and look for Cache-Control, Expires, ETag, and Last-Modified headers. These control how browsers and CDNs cache your content.
How to find what server a website is running?▾
Check the Server and X-Powered-By headers in the response. These often reveal the web server software and technology stack used.
How to check if HSTS is enabled on a website?▾
Look for the Strict-Transport-Security header in the response. This header enforces HTTPS connections and protects against downgrade attacks.
How to debug HTTP headers without developer tools?▾
Use our online HTTP header checker instead of browser developer tools. Enter any URL and get a clean, readable view of all response headers.