HTTP Header Checker

Enter a URL to inspect its HTTP response headers, including status code, server details, caching information, and security headers.

Header Name	Value

HTTP headers are the core part of HTTP requests and responses, carrying information about the client browser, requested page, server, and more.

General Headers: Apply to both requests and responses (e.g., Connection).
Request Headers: Contain more information about the resource to be fetched or about the client itself (e.g., User-Agent).
Response Headers: Hold additional information about the response, like its location or about the server providing it (e.g., Server).
Entity Headers: Contain information about the body of the resource, like its content length or MIME type (e.g., Content-Type).

About HTTP Header Checker

Check the HTTP headers returned by a web server. Analyze status codes, content types, and security headers.

Fetch a URL and inspect status plus response headers that control caching, content type, redirects, security, cookies, and browser behavior.

Diagnostic scope Fetch a URL and inspect status plus response headers that control caching, content type, redirects, security, cookies, and browser behavior.
Target input Enter a complete HTTP or HTTPS URL, including the path whose actual response should be evaluated.
Checks to review Review the status code, redirect location, content headers, cache policy, CORS, cookies, CSP, HSTS, framing, and MIME-sniffing protections.
Diagnostic result The report exposes raw and interpreted headers for debugging deployments and identifying missing or contradictory policy.

Follow this workflow to work with HTTP response headers safely and accurately.

Enter the target Enter a complete HTTP or HTTPS URL, including the path whose actual response should be evaluated.
Select the diagnostic scope Review the status code, redirect location, content headers, cache policy, CORS, cookies, CSP, HSTS, framing, and MIME-sniffing protections.
Run the network check Run the HTTP response headers diagnostic and retain status, timing, returned values, and the observation point needed to reproduce it.
Correlate the result The report exposes raw and interpreted headers for debugging deployments and identifying missing or contradictory policy.

Check every redirect hop and the final response; policies can differ along the chain.
Evaluate HTML, API, asset, and error responses separately because they often use different header rules.
Test from a real browser as well when cookies, service workers, authentication, or client hints affect the response.