HTTP header checker
The HTTP header checker requests a URL and lists every response header it returns, with the security and caching headers explained in plain language.
- Free, no sign-up
- Results in seconds
- Checker · 35 free tools
This checks one page. The same problem usually repeats on every page built from the same template. Plans start at $14.99 a month.
How to use the http header inspector
- 1
Paste an address
A full URL or just a domain. We add https:// when it is missing.
- 2
We fetch it live
Our server requests the page now, the way a crawler would, and records what came back.
- 3
Read the evidence
Every result shows the value we read, so you can see why it passed or failed.
- 4
Fix and check again
Change the page, run it once more, and ship when the second run agrees.
What this does not measure
We would rather say what a tool cannot see than let a clean result mislead you.
- It shows one response from one location. A CDN may serve a different set of headers to a different region.
- HSTS and CSP are reported as present or absent, not graded. Whether a policy is appropriate for your site depends on what your site does.
- Header names and values are shown as sent. It does not interpret a vendor-specific header it does not recognise.
Want the full picture?
This tool answers one question. A full audit runs every check on a page, scores it, and gives you a short list of what to fix first.
Questions about the http header inspector
More in the guides.
Keep reading
noindex vs robots.txt disallow: which one removes a page from Google?
Disallow stops crawling. noindex stops indexing. Using both at once means Google never reads the noindex.
HTTP status codes for SEO: 404 vs 410, soft 404s, 5xx, and 429
Google treats 404 and 410 the same. 5xx and 429 slow crawling. A 200 error page is a soft 404.