WEBSITE CHECK

HTTP header checker.

Inspect a public website’s response headers, redirects, status code and common browser-facing security settings.

Related network tools

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Test whether a TCP port on a public host is reachable from PacketPint.

DNS Lookup

Check DNS records, name servers and mail routing for a domain.

Ping Test

Check public-host reachability, latency and packet loss.

Traceroute

Trace network hops to a public host or IPv4 address.

Frequently asked questions

Technical context and standards

What are HTTP response headers?

HTTP response headers are fields a server sends with a response. They describe details such as content type, caching rules, cookies, redirects and how a browser should process the response.

Relevant standard: RFC 9110 — HTTP Semantics

Why does the checker show more than one response?

A website can redirect a request to another address, for example from HTTP to HTTPS or from one path to another. The tool lists each response in the redirect chain.

Relevant standard: RFC 9110 — HTTP Semantics

What do cache-related headers control?

Cache directives tell browsers and intermediary caches whether a response may be stored and reused, and for how long. They can affect performance and whether a visitor receives a fresh response.

Relevant standard: RFC 9111 — HTTP Caching