HTTP headers lookup
HTTP headers lookup displays response header names and values for a URL. Inspect caching, redirects, server information, and security settings online.
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What is HTTP headers lookup?
HTTP headers lookup displays the headers returned with a webpage response. These fields describe how a response should be handled and can reveal useful details about caching, content type, redirection, and security configuration. They complement the visible page when you are troubleshooting delivery behavior.
How to use this tool
Enter the complete URL and submit the lookup. Read each header name together with its value, then focus on the setting relevant to your investigation. Compare HTTP and HTTPS addresses or different paths when a configuration appears inconsistent across your site.
Understanding the results
Headers describe the particular response received by the checking service. A CDN, proxy, cache, or application can add or replace them, so the values may differ from the configuration file on your origin server. One request cannot establish that every page uses the same settings. If a redirect is involved, inspect its sequence separately before attributing a header to the starting URL.
Frequently asked questions
Does a missing header always mean a problem?
No. Relevance depends on the response and your application requirements. Review the purpose of the header before changing server settings simply to increase the number of fields.
Can this change my website headers?
No. It reads a response. Make changes through your supported hosting or application settings, then repeat the lookup to confirm the published values.
Continue your review
For a more complete picture, combine these findings with URL redirect checker, HSTS checker, and Server compression checker.
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