HTTP Headers Lookup
Response headers control caching, security and how browsers treat a page. The tool requests the URL and lists the headers of the answer.
Checked by our server, free and without an account
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What the tool looks at
- Status code and every response header with its value.
- Long values are shortened to keep the list readable.
How it works
- Enter the address. Only public web addresses on the standard ports are accepted.
- Our server fetches what the check needs once, with its own honest bot name, and evaluates it.
- You get the evaluated values with a short explanation. Nothing from the page is stored.
More Technical tools
All tools- Doctype CheckerCheck whether a page declares a doctype – without it, browsers render in quirks mode.
- Meta Charset CheckerCheck the character encoding of a page – declared in the HTML and set to UTF-8?
- Meta Viewport CheckerCheck the viewport meta tag of a page – required for a proper layout on phones and tablets.
- Meta Refresh CheckerFind meta refresh tags on a page – automatic reloads and redirects that confuse visitors and crawlers.
- Deprecated HTML Tags CheckerFind outdated HTML elements such as center, font or marquee on a page.
- Inline CSS CheckerCount inline style attributes on a page – they make the HTML heavier and harder to maintain.
- Website Reachability TestTest whether a website answers right now – status, connection time, TLS handshake and time to first byte.
The whole page in one audit
One audit runs more than 50 tests, rates them by severity and turns them into a score. Websites are re-checked on a schedule.