Enter your target
Use the input above. Start with an example if you want to explore.
Live diagnostic
HTTP Headers Check.
Inspect response headers, caching rules, and website security headers.
HTTP Headers Check
Enter a target to start a live check.
Try an example
Ready for your first check
Enter a target above. Your records and diagnostic results will appear here.
Using HTTP Headers Check
Run the check
Results come from a live query. Unavailable checks are reported clearly.
Keep the useful details
Copy or download your results. Follow a related tool to continue diagnosing.
Why can a check be unavailable?
Some servers block diagnostic traffic, DNS resolvers time out, or public data providers limit requests. An unavailable check is not a successful result. Try again later or compare with another tool.
Where are the checks performed?
Network and DNS requests originate from the server running this site. Propagation compares multiple public resolvers; their marked operator regions are not separate measurement probes. IP location information is approximate.