HTTP Headers Checker — Free Online

HTTP Headers Checker — Free Developer Utility

HTTP Headers Checker — fetch and display all HTTP response headers from any public URL. HTTP headers contain critical information about a server's configuration, security posture, and content policies. Security headers like Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options protect against common web attacks — their presence or absence immediately indicates the security quality of a web application. Caching headers like Cache-Control and ETag affect performance. Content-Type headers determine how browsers process responses. Our checker fetches the headers and displays them with color-coded security analysis.

Keywords and Search Terms

Developers searching for this tool use terms like: http headers, response headers, security headers, check http headers, content-type header. Tooliby provides this utility free with no signup, no watermarks, and no data logging.

Privacy — Your Data is Never Stored

Every input you paste into Tooliby developer tools is processed in memory and immediately discarded. We do not log inputs, store results, or analyze your data. Your code, tokens, API keys, and sensitive strings stay completely private.