Developer
HTTP Header Inspector
Review raw response headers for security gaps, cache behavior, and CORS posture without relying on external scanners.
Response headersOne header per line
Security and caching
private, max-age=60
CORS allows *.
FindingsMissing or risky headers
A CSP helps reduce the impact of script injection and third-party asset drift.
HSTS helps keep repeat traffic on HTTPS after the first secure visit.
Referrer-Policy helps control what navigation context is leaked to downstream requests.
Permissions-Policy narrows access to browser capabilities such as camera and microphone.
A wildcard Access-Control-Allow-Origin header is convenient, but it can be too broad for authenticated or internal APIs.
Paste raw headers
You can paste headers copied from DevTools, curl -I output, or an API gateway log snippet. The tool summarizes what is present and what is missing.
Use this tool when
These are the practical situations where this workflow usually earns its keep.
You copied raw response headers from DevTools, curl, a gateway log, or an API trace and need a fast review.
You want to check whether caching or CORS settings look obviously wrong before escalating to the backend or platform team.
You need to spot missing security headers without relying on a heavier external scanner.
Browser and API debugging
Header inspection is useful when a response behaves differently across environments and the root cause may be caching, CORS, or a missing browser-facing protection.
Security and platform review
Teams can use a local header pass to spot obvious gaps before a formal security review or infrastructure change discussion starts.
Support-case evidence cleanup
A smaller summary helps support and engineering teams exchange the key finding without passing around the entire captured header set repeatedly.
Common mistakes to avoid
These are the checks that usually keep the output useful instead of misleading.
Treating a good score as proof that the whole endpoint is secure.
Ignoring the raw header block after reading the summary when duplicates or proxy-added values may still matter.
Focusing only on security headers and missing the actual cache or CORS problem that broke the workflow.
Learn how to use this tool
Review copied response headers for security posture, caching behavior, and CORS configuration before the issue disappears into a browser tab or proxy chain.
Read the guideTell us what is missing
If this flow helped only partly, leave feedback so we can understand the missing step or edge case.
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