What is X-Robots-Tag?

It is an HTTP header that can tell search engines whether to index or follow a response. It can apply to pages and files.

Why do security headers matter for SEO?

They are not simple ranking switches, but secure, stable pages protect users and reduce technical risk.

Is gzip or Brotli better?

Both are useful. Brotli often compresses text assets better, while gzip remains widely supported.

Why does a header differ from what I see in the browser?

CDNs, redirects, user agents, and request methods can change responses. Test the exact URL and path you care about.

Technical SEO

Live

HTTP Header Auditor

Audit response headers: caching, compression, security, robots.

URL

We send a HEAD request and audit the response headers.

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Start here · What are HTTP headers?

HTTP headers are small pieces of information a server sends before the page body. They can describe caching, compression, content type, indexing rules, and security behavior.

Beginners often only inspect visible HTML, but a header like X-Robots-Tag: noindex can block indexing even when the page looks normal.

This auditor sends a header request, shows the HTTP status, checks common headers, and lists the raw response headers for developer handoff.

When to use this tool

Indexing mystery
Check whether an invisible X-Robots-Tag is telling search engines not to index a URL.
Performance basics
Confirm compression and Cache-Control headers exist before deeper speed work.
Security QA
Spot missing HSTS, Content-Security-Policy, X-Frame-Options, and Referrer-Policy headers for developer review.
Migration validation
Audit headers on new templates after moving hosts, CDNs, or frameworks.

Examples

Walk through these with the form above — they are practice scenarios, not live data.

Noindex header check

Try this

Enter a URL that is unexpectedly missing from Google.

What to look for

Look for an error on X-Robots-Tag. If it says noindex, fix the server, CDN, or framework response.

Compression check

Try this

Fetch the home page or a heavy landing page.

What to look for

Look for content-encoding values such as Brotli or gzip, then check Cache-Control for repeat-visit caching.

Short tutorial

Follow in order the first time you use the tool; later you can skip to the step you need.

Step 1 - Enter a full URL
Use the live https:// page you want to inspect. Header behavior can differ by host, path, and CDN rule.
Step 2 - Fetch headers
Review the status code first, then scan warnings and errors in the audit card.
Step 3 - Expand raw values
Copy exact header names and values into developer tickets so the fix is precise.
Step 4 - Verify at the source
Header problems may come from the app, server, CDN, or security plugin. Fix the source and rerun.

More detail

New here? Skim Start here first, then run one Examples scenario in the form above.

HTTP Header Auditor does one job: audit response headers: caching, compression, security, robots. It lives under Technical SEO on SEOToolkits, where the beginner idea is simple: Technical SEO keeps pages crawlable, indexable, fast enough, and understandable to search engines.

FAQ

What is X-Robots-Tag?: It is an HTTP header that can tell search engines whether to index or follow a response. It can apply to pages and files.
Why do security headers matter for SEO?: They are not simple ranking switches, but secure, stable pages protect users and reduce technical risk.
Is gzip or Brotli better?: Both are useful. Brotli often compresses text assets better, while gzip remains widely supported.
Why does a header differ from what I see in the browser?: CDNs, redirects, user agents, and request methods can change responses. Test the exact URL and path you care about.