HTTP Headers Checker
Fetch a URL and see the response headers and status code. Useful for debugging.
Try it with this example
Enter https://example.com to see its response headers, status code, redirects, cache headers, and security headers such as Content-Security-Policy.
What is this tool?
Every time your browser or an app requests a webpage, the server responds with HTTP headers—invisible metadata that controls caching, security, redirects, and content type. Headers tell the browser how long to cache a page, whether to use HTTPS, what character set the content uses, and much more. For developers and site owners, inspecting these headers is essential for debugging, SEO, and security. The HTTP Headers Checker lets you see them for any URL in seconds.
Enter a URL—for example https://example.com—and the tool fetches the response headers without loading the full page. You'll see the HTTP status code (200 OK, 301 Moved Permanently, 404 Not Found), the Content-Type, Cache-Control directives, and security headers such as Strict-Transport-Security and Content-Security-Policy. Redirects are followed, so you can trace a chain of 301 or 302 redirects to the final destination. This is useful when verifying that your CDN or load balancer is configured correctly, or when tracking down why a link behaves differently than expected.
CORS (Cross-Origin Resource Sharing) headers are critical for APIs and web apps that make requests from different domains. If your API isn't accessible from your frontend, the headers often reveal why: missing or incorrect Access-Control-Allow-Origin, or missing preflight headers. Checking headers before debugging in the browser saves time. SEO practitioners use header checks to verify canonical URLs, check for soft 404s, and ensure mobile-friendly signals. Cache headers affect performance: long max-age values reduce server load but can delay updates; short values keep content fresh but increase traffic.
Security headers matter for every site. Strict-Transport-Security (HSTS) forces HTTPS. Content-Security-Policy restricts where scripts and resources can load from, reducing XSS risk. X-Frame-Options prevents clickjacking. The headers checker shows which of these your site sends and what values they have. Many security scanners and compliance checks look at these headers; seeing them here helps you fix issues before an audit. Third-party services and APIs also expose headers—checking them helps you understand rate limits, authentication requirements, and response formats.
The tool sends the request from our server so you see the headers as our server receives them. That differs slightly from what your browser sees (e.g. your browser might add Accept-Language or cookies). For most debugging and verification, the server-side view is what matters. No signup or API key is required. Paste a URL, click check, and review the headers. It's one of the fastest ways to understand how a site or API responds.