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Network

HTTP Headers Viewer

An HTTP headers viewer shows the full set of response headers a URL returns — caching rules, content type, server software, cookies and security policies. These headers control how browsers, CDNs and crawlers treat your page, and most misbehaviour that looks inexplicable in the browser is explained by one of them.

Last updated · Free, no signup

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What can an HTTP headers viewer reveal?

An HTTP headers viewer displays the metadata a server returns alongside a resource, including content type, caching directives, cookies, security policy, server hints, and cross-origin rules. Reviewing the raw values can explain CDN behavior, stale content, download handling, browser protections, and unexpected rendering.

This probe makes one anonymous server-side GET request with an eight-second timeout and does not follow redirects, so the status and headers belong to that response rather than the final destination. It sends no session cookies or custom authentication and may therefore see different content from a signed-in browser.