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Security Header Analyzer

Analyze security headers with pass/warn/fail scoring and remediation guidance.

: 16/16 (100%)PASS 8WARN 0FAIL 0

Content-Security-Policy

PASS

CSP present with safer baseline directives.

default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'; base-uri 'self'

Strict-Transport-Security

PASS

HSTS is configured with strong baseline.

max-age=31536000; includeSubDomains; preload

X-Frame-Options

PASS

Anti-clickjacking policy is configured.

DENY

X-Content-Type-Options

PASS

MIME-sniffing protection is enabled.

nosniff

Referrer-Policy

PASS

Referrer policy is privacy-conscious.

strict-origin-when-cross-origin

Permissions-Policy

PASS

Permissions-Policy is present.

camera=(), microphone=(), geolocation=()

Cross-Origin-Opener-Policy

PASS

COOP is configured for isolation.

same-origin

Cross-Origin-Resource-Policy

PASS

CORP header is present.

same-origin

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Security Header Analyzer: complete usage guide

Analyze HTTP security headers and receive pass/warn/fail scoring with remediation guidance for safer web deployments.

What this tool does

It parses raw response header blocks including optional status lines.

It evaluates critical security headers and classifies each as pass, warn, or fail.

It computes an overall security score with status counts.

It generates a copyable report with actionable remediation hints.

Typical use cases

Audit security header posture before production release.
Compare environment drift between staging and production responses.
Guide remediation tasks for CSP, HSTS, and related policies.
Include repeatable header-check evidence in security reviews.
Monitor regressions after CDN, proxy, or middleware changes.

Input examples

Raw headers

content-security-policy: ...\nstrict-transport-security: ...

Security sample

x-frame-options: DENY\nx-content-type-options: nosniff

Optional status line

HTTP/2 200

Output examples

Score

Score 14/18 with PASS/WARN/FAIL counts

Per-header assessment

CSP pass, HSTS warn, COOP fail with recommendations

Copy report

formatted security header summary for tickets and audits

Common errors and fixes

Headers pasted in non-standard format

Use one `name: value` pair per line.

False negatives from missing proxy headers

Capture final response headers from edge/prod path.

Score interpreted as compliance certification

Use score as guidance, not legal/compliance guarantee.

Outdated policy assumptions

Review recommendations against current browser support and org policies.

Copying incomplete report context

Include environment URL and timestamp with copied output.

Security and privacy notes

For the shared privacy terminology, local processing model, external-request labels, and DevTools verification workflow, see the Trust Center.

Header analysis is local and does not require server submission.
Redact sensitive proprietary headers before sharing outputs.
Store audit artifacts in approved security documentation systems.

Step-by-step workflow

Feed Security Header Analyzer the smallest reproducible sample you can collect from the real issue.
Review the first findings and separate confirmed signals from assumptions or environment-specific noise.
Compare a clean baseline sample against the problematic input when you need to isolate regressions.
Keep one redacted output snapshot with the key findings for tickets, runbooks, or incident handoff.

Quality checklist before sharing output

Confirm Security Header Analyzer findings still reproduce with the same input and assumptions.
Check that the sample includes enough surrounding context to support the conclusion you are drawing.
Translate notable findings into concrete next checks, ownership, or remediation notes.
Redact private hosts, tokens, certificates, or customer identifiers before sharing analysis output.

Operational notes

Security Header Analyzer is most effective when it produces a focused, reproducible evidence bundle that can be handed to the next engineer without extra cleanup.

Frequently asked questions

What does pass/warn/fail mean?

It indicates whether header presence and configuration meet baseline expectations.

Can this detect every web security issue?

No, it focuses on header-level posture only.

Should I run this after every infra change?

Yes, especially after proxy, CDN, or middleware updates.

Can I copy a full report summary?

Yes, report copy action is built in.

Does a high score guarantee full security?

No, combine this with broader security testing practices.

Privacy: Browser-local first; external requests are labeled

Open Source: Verify on GitHub

How to verify: Open DevTools Network panel

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Install guide