HTTP Header Analyzer
Parse raw headers and highlight content types, auth hints, caching directives, and likely debug concerns.
What is HTTP Header Analyzer?
Review a header block for debugging hints while keeping request and response context separate. Security and caching behavior depend on the resource, browser, origin and intermediaries.
How to use HTTP Header Analyzer?
Step 1
Paste raw header text from a request or response.
Step 2
Review the parsed output and the analyzer summary.
Step 3
Use the observations to guide debugging on the next request.
Example input / output
A response with Cache-Control: no-store has a different caching intent from max-age=600. Compare it with the request method, status and authorization context before changing a gateway rule.
Example input
HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-store
Authorization: Bearer token
X-Request-Id: req-123Check the result
- Analyzer notes are heuristic and should complement, not replace, protocol knowledge.
- Headers copied from browser tools sometimes include pseudo-lines or formatting noise.
Practical developer examples
Inspect CORS as a group
Check Access-Control-Allow-Origin, credentials, allowed methods and the OPTIONS response together. One header cannot establish that the browser can read the response.
Match content and cache policy
Compare Content-Type, content encoding, vary fields and cache directives. A proxy's cached variant can explain a mismatch that is absent in application logs.
Common developer use cases
Suggestions are context-dependent hints, not a security certification. The tool does not contact a URL, simulate a browser or inspect TLS.
Common issues
FAQ
Is a missing security header always a vulnerability?
Its importance depends on the resource and threat model. Review the application context rather than applying every header blindly.
Can the analyzer fix my server?
No. It helps inspect text; apply changes in the server or gateway and verify the actual response.