HTTP Headers Checker

Inspect response headers, redirect chains, and security headers for any URL. Useful for debugging redirects, CORS, and server config.

Related reading

How to check an SSL/TLS certificate (and what to look for)
Every HTTPS site relies on a TLS certificate. Here's how to read one, what each field actually means, and the things that should make you suspicious.
How to read an open port (and when to actually worry)
An 'open port' isn't a vulnerability by itself — it's information. Here's how to tell whether a port being open is fine, suspicious, or actively dangerous, and what to do about each case.
How to check DNS propagation (and how long it actually takes)
Just changed an A record and your friend in another country still sees the old site? That's DNS propagation. Here's how to verify when it's actually done — and how long it can take.