HTTP

X-Content-Type-Options Checker

Check X-Content-Type-Options: nosniff. Prevent MIME sniffing. Barrion, OWASP.

Prevents MIME type sniffing. Required for A grade.

How to use

  1. Enter a domain, URL, or value relevant to X-Content-Type-Options Checker.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for X-Content-Type-Options Checker.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Example inputs

example.comgithub.com

Common issues and fixes

Not set

Browser may MIME-sniff. Add X-Content-Type-Options: nosniff.

Wrong value

Only nosniff is standard. Other values are ignored.

Recommended remediation

Add X-Content-Type-Options: nosniff to all responses. Prevents MIME confusion attacks.

FAQ

Is X-Content-Type-Options Checker free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

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